On Linux, where are a game's .json files located?

[tabicat]

They're not stored in my Documents folder because TTS is running under a Windows emulator (Proton).

The reason I ask is that I've created a custom tile and I need to set it to a specific size, and apparently the only way to do that is by editing the .json file for the tile directly. Is this correct?

Also, while I have your attention, is there any way to remove the brown border around a custom board?

[tabicat]

I got the answer on the Steam forum: ~/.local/share/Tabletop Simulator/Saves