When unplugging one monitor from dual monitor setup, apps/programs don't switch to other monitor automatically

I am using Windows 10 and did not have this problem until about 3 days ago

I have a dual monitor setup

My left monitor is my main monitor and my right monitor is my secondary monitor

I will often unplug my main monitor and plug in my PS4 to play games

Before this problem started occurring, I would unplug my main monitor and all browser windows, apps and programs would automatically switch/jump to the monitor on the right

I don't know if I unknowingly altered some settings but now when I unplug the main monitor, all apps/browser windows etc will be in limbo and I will have to move them one by one using the windows button + right arrow key to my secondary monitor

I have made no hardware changes - the only thing I can think of is that there was a Windows 10 update - but would seem odd that it would affect my dual monitor setup

Has anyone encountered this problem? Would appreciate a solution

thanks!!