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How you configure the mouse depends on where your UI lives — in the browser overlay or inside Unreal itself.

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For web-based UI

Hide Unreal’s cursor and let the browser handle it.

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Hide Unreal’s cursor

1

Open Pixel Streaming plugin settings

Project Settings → Plugins → Pixel Streaming.
2

Set Default Cursor Class Name to HiddenCursor

Stops UE from drawing a second cursor.

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Mouse capture and lock

1

Open Edit → Project Settings → Engine → Input

Engine Input settings.
2

Set Default Viewport Mouse Capture Mode

Capture Permanently Including Initial Mouse Down.
3

Set Default Viewport Mouse Lock Mode

Do Not Lock.

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Disable Hovering Mouse in Streampixel

In the dashboard, set Project Settings → Hovering Mouse → Disabled so the browser’s native cursor stays active.

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For in-game (Unreal) UI

Show Unreal’s cursor and lock it inside the viewport.

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Show Unreal’s cursor

In the Pixel Streaming plugin, set Default Cursor Class Name to DefaultCursor.

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Lock the cursor

1

Edit → Project Settings → Engine → Input

2

Default Viewport Mouse Capture Mode

Capture Permanently Including Initial Mouse Down.
3

Default Viewport Mouse Lock Mode

Pick one: Lock On Capture, Lock Always, or Lock in Fullscreen.
In the dashboard: Settings → General → Mouse Lock → Enabled. The cursor stays inside the stream until the viewer presses Escape.

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Toggle cursor visibility at runtime

Switch between hidden and visible based on game state — e.g. hide during gameplay, show in menus.

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From Unreal

Send a JSON message via Send Pixel Streaming Response:

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From an iframe

Use postMessage with the same JSON. See stream control commands.

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In-game menu cursors

Toggle cursor visibility from Blueprints:
  • HiddenCursor to hide
  • DefaultCursor to show
Pair with input mode changes:
  • Set Input Mode Game Only — gameplay
  • Set Input Mode Game and UI — menus