Game offers on this machine only 1920 x 1080 as max resolution, while the screen is 1920 x 1200. Unity doesnt seem to recognize the native screen size properly.

Is there any "hidden" commandline param to set custom resolution, that doesnt get overwritten by the starter config window?

*Windowed mode works, but not borderless.
**Borderless Screen only via cmd param "-popupwindow" , but only for the given resolutions in the launcher.

Did you ever find a fix? The game does exactly the same on my end. I got three displays at 1680x1050 and all of them are recognized at different, lower resolutions.

only in idea-state so far:

- windowed mode works for custom resolutions (when you switch it to max while the game is loading. if you do it ingame, often the error occurs that your bar displays are missing any description text / numbers)

- starting the game with the borderless cmdline option removes the possibility to resize the window via mouse click/drag.

so- the solution is to use autohotkeys window commands to set size and mode of a window once its running.
did that with some tools i wrote for other software, so hopefully it may work for an unity-window too.

will tell, when im sucessful :)

so, done. :)
its a bit crude, rather proof of concept, but it does what it supposed to

- run the TD_screenmax.exe (compiled ahk script) *
- when you start the game, chose the "windowed" checkbox.
- after clicking play and game loading window appears (and its active), press <window key> + <w> to maximize it.
(dont change the size once the game is loaded, the ui gets a bit fucked up, when you switch to/from unknown resolutions)

*
Download exe:
https://drive.google.com/file/d/1WbqViqlOGgJvjwzdM1kf5ULLGbNoU9C6/view

Download src:
https://drive.google.com/file/d/1fq5RX9tLv5WCQgm2dutSmJhYlD1VTi7q/view

Scanresults:
https://www.virustotal.com/gui/file/cfca673a5e582c024efbd842dd123ea1a72d092fdd8dfe1fdba3cc4c8226214c/detection