Apex loads in window and causes it to crash

@Gilmartini  Hi, that's strange indeed, can you post your dxdiag?

As for forcing the game back to fullscreen, that should be easy enough. 

If you go to C:\Users\(your username)\Saved Games\Respawn\Apex\local, you can open the videoconfig file with notepad. 

In there about 2/3rds of the way down you'll see  "setting.fullscreen" "0". If you change this 0 to a 1 then save the file that should tell the game to start in fullscreen. 

You may also want to check that your "setting.defaultres" and "setting.defaultresheight" match values match your monitor's resolution width and height too.

Edit: thanks Bluelagoon.

Thanks.