OPTION 1:
To manually clear your settings cache open the start menu and type:
%Localappdata% and hit enter
Find the "PostScriptum" folder in the window that pops up and simply delete it.
This will wipe all config settings for the game such as keybinds and video settings.
Now try launching Squad 44 to see if it has resolved whichever issue you had previously.
You can also manually navigate to it as the path is seen above in the red box.
OPTION 2:
Run Squad 44. In the main menu go to "SETTINGS" then "GAME SETTINGS."
Click on "CLEAR CACHED USER DATA."
This will wipe all config settings for the game such as keybinds and video settings.