Note: This update is for the Steam Deck Beta and Preview channels, and includes new features that are still being tested. You can opt into this in Settings > System > System Update Channel.
The Steam Client Beta has been updated with the following changes:
Desktop Mode
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Added In-Game setting to allow enabling or disabling display scaling in the overlay.
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Changed behavior of overlay tabbed browser to clear all tabs when the close button is clicked and added a minimize button to hide the browser as the close button previously did.
Source: https://store.steampowered.com/news/app ... 3022095825