Informations:
My screen size: 3840 * 2160
Scaling (on windows operation system): 175%
Anno Game resolution: 1920 * 1080
Description: If I exit the running gameplay with Alt + Tab and then back again, the resolution in the game will change to 3840 * 2160 pixels. Then, I open the running game settings and the resolution is left at 1920 * 1080 pixels. I have to change it to 3840 * 2160 pixels and then back to 1920 * 1080 pixels so that the game will regain its normal FHD resolution (1920 * 1080).
Version: GameUpdate 13.1, All DLCs including cosmetic DLCs. No mod installed.