Issues with autofill and full screen on mac

I am using macOs and firefox (all updated), now when I am on fullscreen and I use the autofill shortcut in bitwarden it opens a new window move me to it and then when I use my fingerprint it sometimes move me back to the original window I started with and sometimes it does not. Can I just somehow stop the new window behavior ? or just make the new window be a pop-up window that just sets on top of the current window I am using ? It is just super annoying when I am using full screen, when I am not it is just fine.

I tried it with chrome as well and had the same issue.