The Steam Client Beta has been updated with the following changes:
General
Fixed some confirmation dialogs not closing with the cancel or X buttons.
Fixed "Clear Download Cache" also deleting cached login information.
Added timer to the overlay. You can enable this button in the in-game settings.
Fixed an issue that could cause a Steam Guard code to fail the first time it is entered, and then succeed immediately after that.
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Fixed Steam Overlay not respecting Windows scale factor for full screen windows at heights
Source: https://store.steampowered.com/news/gro ... 1555027055