Recently I was tyring to play some Steam Windows games under Linux, using their Proton support.
I fired up Racedriver Grid from 2008, unfortunately the resolution was capped at a fairly low resolution 1280x876 I think, and it wasn’t possible to select 1080p. Note that this isn’t a linux specific problem.
To resolve this, locate the file hardware_settings_restrictions.xml within the game install, for me this was in ~/.local/share/Steam/steamapps/common/Grid/system/hardware_settings_restrictions.xml
Find the section below and remove it.
<data>
<res mem="270" maxWidth="1280" />
</data>
Upon restarting the game you should now be able to select higher resolutions.