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:
General
Fixed setting the correct AppID in Source SDK mod manager.
Preview Only
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Updated the framerate limit slider to include the screen's current refresh rate.
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Fixed a case where the framerate limit would not apply to some external displays.
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Framerate limit settings are now stored separately for each display.
Source: https://store.steampowered.com/news/app ... 5501064561