How do I make plug in window stay on top?

I have a set-up with three monitors. Often I will watch YT videos on my right monitor, when I try to learn a plug-in, open on my center monitor.
Now it’s Superior drummer 3 and the Tracker. So on the main monitor I have SD3 and on my right monitor I have Safari with a YT, but when ever I select Safari on the right monitor, SD3 dissapears on my main monitor.
How can I avoid that?
Thanks in advance!!!

There is an option in preferences under vst plugins.

Well that’s on: