In game, under SETUP and then Graphics (I think), isn’t there a drop down for Resolution? (maybe under Advanced).
Is your full screen resolution a choice? If so, select it.
Got BMS up in running on my Windows 7 laptop just in time for college so now I can still play plus SweetFx and all the shaders are working flawlessly now so gotta say I like the game way more now that I experience it fully.
Next step…Joining a VFW hopefully if college work dont be too busy