I've recently had my friend install DM 64.1 on forge 1.12.2 - 14.23.5.2859. They have no other mods except this one, its a fresh install of both DM and forge. I walked them through it to make sure it was installed correctly, it doesn't crash, forge initializes the mod correctly, but when launched it opens in fullscreen, white (or whatever the majority color of the screen is) with the game being visible in the bottom left corner. The buttons however, still function as if they were in their normal places, instead of where they appear. This has rendered the game unplayable, and is understandably quite frustrating. Any help is appreciated, thank you.

Have you tried pressing F11 on your keyboard to exit full screen?

 Yes, it didn't work at all.

Hmmm, well thats very odd. Is there any way to go into options and see if there might be a video setting that you can change? Other than that im not sure, seems like it might be broken. You can also try reinstalling it if you think that could help.

Does this happen every time you launch the game?

 It does happen every time its launched, I'll try reinstalling, but I'm not sure if it will work

UPDATE: Putting the game into fullscreen before forge finishes initializing, then minimizing at the menu screen worked. Thank you!

Problem solved, thread locked.