This tutorial will show you how to hide or show the background in the Paint app in Windows 11.
The Paint app included in Windows 11 is a simple and powerful graphics editor with a range of uses. You can edit images quickly or create masterpieces with the tools in this app. Once you’re done, you’ll be able to save and share your files in almost any format.
Starting with Paint app version 11.2402.20.0 for Windows 11 Insiders in the Canary/Dev, Beta, and Release Preview Channels, Microsoft has updated the Layers feature to now add a new tile that lets you hide or show the background on demand.
Reference:

Paint update begins rolling out to Windows Insiders
UPDATE 3/21: The below update for Paint that introduces a new size slider for pencil, brushes, and eraser tools has begun rolling out to Windows Insiders in the Beta and Release Preview Channels. Hello Windows Insiders, toda

Here's How:
1 Open the Paint app.
2 Click/tap on the Layers button in the ribbon. (see screenshot below)
3 Perform one of the following actions to toggle hide/show background: (see screenshot below)
- Press the Ctrl + Shift + H keys.
- Hover the pointer on the bottom tile in the Layers panel, and click/tap on the eye icon on the tile.
- Right click on the bottom tile in the Layers panel, and click/tap on Hide background or Show background.
That's it,
Shawn Brink
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