I'm running Calibre 3.17.0 on Linux. I want to change the interface font.
I went into the Look & feel preferences and set the new font (to Inconsolata) and hit Apply. The new font took effect immediately! and I was prompted to restart Calibre.
After the restart, the font has reverted to the old font. When I view Look & feel again, it says that my current font is Inconsolata, but that's not true.
I've tried deleting the entire calibre config directory and starting from scratch, but it doesn't help.
I am able to set other preferences options with no problem.