Serious Sam — 3 Cannot Set Display Mode Top

: Run the DXSETUP.exe found in the game's installation folder (usually under a Redist or _CommonRedist folder).

Find the line fullscreen = 0; and change it to fullscreen = 1; to force the game to start in fullscreen mode. Save the file and try launching the game. 2. Verify Game Files serious sam 3 cannot set display mode top