Play In Editor Settings | Unreal Engine 4.27 Documentation

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There are two ways to open the Play settings panel.

Open the Play settings panel by clicking Edit > Editor Preferences.

Then, select the Play in the Editor Preferences window.
Or, from the Play dropdown menu, click Advanced Settings.

Play In Editor

The Play In Editor settings allow you to change different behaviors during a session. These settings only apply for Play In Editor sessions that display in the Level Viewport. As a result, there are no default window sizes to set.

Setting	Description
Game Gets Mouse Control	Enables game mouse control when PIE starts.
Use Mouse for Touch	Sends mouse movement and clicks as touch events during PIE
Show Mouse Control Label	Displays "Click for Mouse Control" and "Shift + F1 for Mouse Cursor" messages during PIE.
Mouse Control Label Position	Determinies location to anchor the Mouse Control label on screen during PIE.
Viewport Gets HMDControl	Determines if HMD orientation should be used while playing in viewport.
Should Minimize Editor on VRPIE	Minimizes editor on VR PIE.
Auto Recompile Blueprints	Determines whether to automatically recompile Blueprints used in the level when initiating a Play In Editor session.
Enable Game Sounds	Enables sound during a Play In Editor session.
Play In Editor Sound Quality Level	Determines quality level of sound during a Play In Editor session.
Stream Sub-Levels during Play in Editor	Streams sub-levels from disk instead of duplicating editor sub-levels.
Enable PIE Enter and Exit Sounds	Plays a sound when exiting or entering PIE.

Game Viewport Settings

Setting	Description
New Viewport Resolution	Sets the width and height of floating Play In Editor windows (in pixels): Pick from a list of common window sizes, including settings for devices like phones and tablets. New Window Width: Sets the width of the new viewport window (in pixels). A value of zero will use the desktop's screen resolution. New Window Height: Sets the height of the new viewport window (in pixels). A value of zero will use the desktop's screen resolution.
New Window Postion	Sets the screen coordinates for the top-left corner of floating Play In Editor windows (in pixels) This will affect both Play In New Editor Window and Standalone Game: Left Position: Sets the position of the new viewport on the screen, starting from the left (in pixels). Top Position: Sets the position of the new viewport on the screen, starting from the top (in pixels). Center Viewport Position: Enable to always center the position of the first viewport to screen.
Safe Zone Preview	Enables a visual preview of the device safe zone for UI testing.

Play in New Window

When starting a Play In Editor session that displays in a new window, these settings determine the size and starting position of the new window that appears.

Setting	Description
Always On Top	Always have the PIE window on top of the parent windows

Play in Standalone Game

When starting a Play In Editor session that displays in a standalone game window, these settings determine the size and starting position of the new window that appears. You can use these options to pass additional command line settings on to the game client.

Setting	Description
Client Command Line Options	Generates a command line for additional settings that will be passed to the game clients: Disable Sound (~nosound): Disables sound in your standalone games.
Additional Launch Parameters	Adds extra parameters to be included as part of the command line for standalone games.
Additional Launch Parameters for Mobile	Adds extra parameters to be included as part of the command line for mobile-on-PC standalone games.

Multiplayer Options

These are basic and advanced options for networked Play In Editor testing. In addition to the number of players and dedicated server options from the Play dropdown menu, there are settings for URL parameters, gamepad routing, and reverting to the multiple-process testing method.

Setting	Description
Launch Separate Server	Launches a separate server even if the net mode doesn't require it. This allows you to test offline --> server workflows by connecting to a server from the offline game.
Play Net Mode	Sets the net mode used for Play In Editor session: Play Standalone: Starts a standalone game. This will not create a dedicated server, nor automatically connect to one. Play As Listen Server: Enables the Editor to act as both the server and the client. Additional clients can be opened depending on the number of clients. Play As Client: Enables the Editor to act as a client. A dedicated server spawns behind the scenes to connect to.
Run Under One Process	Spawns multiplayer windows under a single instance of UE4. This will load much faster but have the potential for more issues.
Enable Network Emulation	Applies the selected network emulation settings when starting the game for the purpose of testing how your game handles network issues: Emulation Target: Applies the emulation settings to the Server Only, Clients Only, or Everyone. Network Emulation Profile: Applies a preset for incoming traffic and outgoing traffic. Options are Average, Bad, or Custom Incoming traffic: Applies settings that add latency and packet loss to all incoming packets. Can add minimum and maximum latency, as well as a percentage amount of packet loss. Outgoing traffic: Applies settings that add latency and packet loss to all outgoing packets. Can add minimum and maximum latency, as well as a percentage amount of packet loss.
Client	Applies the selected client settings when starting the game: Play Number of Clients: Opens a number of client windows. The first one will respect Play In Editor Modes options. The rest will respect the Run Under One Process settings. Route Gampad to Second Window: Routes the gamepad input suring a multiplayer session. If unchecked, then the first gamepad is attached to the first multiplayer window, the second to the second window, and so on. If checked, then the gamepad is routed to the second multiplayer window, allowing the first to be controlled by keyboard and mouse. Create Audio Device for Every Player: Controls how many audio devices are created. If checked, a separate audio device is created for every player. This will render accurate audio for every player's perspective at the cost of CPU performance. If unchecked, a separate audio device is created for only the first two players. Client Fixed FPS: Sets each client's framerate to an element in the list. Includes a Listen Server.
Server	Applies the selected server settings when starting the game: Server Port: Opens the chosen port for simple server networking. Server Map Name Override: Overrides the map launched by the server. Currently only used by the PIE_StandaloneWithServer net mode. Additonal Server Game Options: Adds additional parameters that are passed to the server as URL parameters. Additonal Server Launch Parameters: Adds additional parameters that are passed to the server as arguments. Server Fixed FPS: Sets the server to run at the specified framerate. Does not impact Listen Server. Multiplayer Viewport Size (in pixels): Spawns additional clients at the width and height specified. Useful when you need multiple clients but only want to interact with one window.

Play On Device

Setting	Description
Build Game Before Launch	Builds the game before launching it on the device: Always: Always build. Never: Never build. If project has code, or running locally build editor.: Build based on project type. If running a locally built editor: Build if using a locally built (i.e non-promoted) editor.
Launch Configuration	Uses the selected build configuration when launching on a device: Same as Editor: Launches on device with the same build confoguration as the editor. Debug: Launches on device with a Debug build configuration. Development: Launches on device with a Development build configuration. Test: Launches on device with a Test build configuration. Shipping: Launches on device with a Shipping build configuration.
Auto Compile Blueprints on Launch	Recompiles dirty Blueprints before launching.

For more information on build configurations, please see the Build Configurations Reference page.

Multiplayer Options (Server Debug Settings)

Setting	Description
Show Server Debug Drawing by Default	Controls the default value of the show flag ServerDrawDebug.
Show Server Debug Drawing Color Tint Strength	Controls how strongly the debug drawing originating from the server will be biased towards the tint color.
Show Server Debug Drawing Color Tint	Debug drawing originating from the server will be biased towards this color.

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