GOG "target" in GUI not visible

Installed some GOG games. They all refuse to work.
So i:
* Clicked the game
* Selected the "cog" -> Properties
* Now we are in the "Shortcut" screen. It contains "TARGET" and "START IN".
Those fields are really small and the "Browse..." button really huge. It is now impossible to read the values.

Additional question. Is there something of a guide to get games working? Logfiles? How to start them in the terminal? etc.

No file, test, or entry point is identified. Reproduce the GOG game's Properties > Shortcut screen and inspect the TARGET and START IN fields; done means their values are readable without the oversized Browse button obscuring them.

Written by the indexing model from the issue text.