Game too large for screen HELP

Not sure if i am posting in the right spot, but i am having serious issues.

I own rdr2 on steam and i have downloaded fiveM. I have a three monitor setup and every time i open five M everything is zoomed in to the point the application is stretched across 3 monitors as if it is one big monitor. If i Alt+Enter it will fit to screen but will turn one side monitor black and will not act as full windowed borderless. If i make windowed borderless it goes back to being the size of 3 screens. Cannot drag corners to fit ans if i kess with it too much the whole app freezes. Cannot find any fix for this anywhere online. Was assuming in was a resolution size thingy in steam for rdr2 but that did not fix. Any help would be appreciated.