Same as the title above. I bought myself a second monitor so I can multitask and do other things while gaming but when I play Fallout 3 through the GOG service it refuses to let my mouse go into the second monitor. I know with Steam you can press shift + tab to allow you to do this. Is there any type of workaround or fix that will allow me to do the same thing with GOG?

Well, I would change your ( pleaseworkfo3 ) to something like ( you had better work me fo3 or I'll play fiddlesticks ) :)

You have to play it in a (borderless) window, not fullscreen.
Try this:
https://github.com/Codeusa/Borderless-Gaming/releases

OK I downloaded the program and I *think* I added FO3 to the borderless program list correctly. when the splash screen shows I added it to the borderless program.

I move the game to the second monitor without issue, but when I still launch the game itself it jumps from monitor 2 to monitor 1. BEFORE the borderless program it would literally swap my desktop from monitor 1 to monitor 2 and the game from monitor 2 to monitor 1

I'm really at a loss on how to stop that.

Have you tried setting up primary/secondary monitor in Windows?
https://www.cedarville.edu/insights/blog/monitor-dual-screen-setup-for-desktop-computers.aspx (the first thing I found)

Why do gamers focus so much on multiple things? Games are not suppose to be Alt+Tabbed out of. You see this complaint so much these days. Here's a tip, it won't have a problem if you don't do it.

Making Fallout 3 work with multi monitor is a pain in the ass, there are mods and prgrams you could use but still it's a mess.