I've literally been having the same exact issues for months and I use 2 monitors. Anytime I'm in borderless windowed or Fullscreen for display, if im lobby the mouse cursor is all good.
This is what happens to me:
1. Choose game type, ready up and start loading into character select (mouse cursor on screen, when normally it disappears)
2. Character selection screen is up and choosing person(cursor is on screen to allow selection)
3. Character selection is over and shows team in pre-game screen(mouse cursor STILL on screen when should be GONE BY NOW)
4. On ship about to jump and using mouse to look at map for where to jump(mouse cursor STILL ON SCREEN when it should ONLY be showing the white dot for where camera is looking)
5. Jump from ship and looking around(cursor still there....you see the pattern here EA/Respawn -_-)
6. Try to click the mouse while looking around/shooting, the cursor will move out of game window to other monitor. I've made another post on this months ago and had a video uploaded hoping that the issue would have been resolved after sending out patching updates...buttttttt here we are.
Not sure if it's just because of a dual monitor setup, video card or something in game but i literally havent been able to play this since the summer and its really unfortunate as i happen to like this game alot. PLEASE FIX THIS ISSUE, I KNOW IM NOT THE ONLY PERSON WITH THIS...My GPU is an AMD R9 290 and playing 100% fine with other games and worked super well until an update over the summer.