Fixing SteamOS Desktop Font Scaling - mdeguzis/SteamOS-Tools GitHub Wiki
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Big fonts (text scaling) fix for SteamOS desktop mode
How To
- Enable linux desktop in Settings -> Interface, then exit to desktop.
- Run Terminal
The fix:
gsettings set org.gnome.desktop.interface text-scaling-factor 1.0
Reset scaling
gsettings reset org.gnome.desktop.interface text-scaling-factor
Source: SteamCommunity