I'm sorry, perhaps because my system is Windows 11, when I tried to follow your steps, it displayed the message "The name specified in the 'Target' box 'F:\H Game\StarSpawn_PublicDemo-2.0h2-Win64\StarSpawn_Demo2.0h2_Win64\StarSpawn.exe -force-d3d12' is invalid. Please make sure the path and filename are correct."
That doesn't make sense, Windows 11 should be pretty close to the same as Windows 10. I doubt they changed that particular interface any. Is that a space after the H? Why would it be in the base folder on the F drive? Anyway, if there's a space, you need to surround the target only in quotes, and then add the -force line after the quotes.
"F:/Game Path/Game.exe" -force-d3d12
If no space, quotes are not needed.