This post is a brief outline of a small but effective fix for an issue with SteamVR's settings menu under Linux on high-DPI or high resolution displays (not sure which is the issue).

Short version: Right click on the titlebar of the window, select "More Actions -> Configure Special Window Settings", and add a property to force the window to at least 800x600.

Credit to Zamundaaa on GitHub for the hint. I'm just hoping to give this a bit more availability through search since I experienced the same issue.