Viewing / Displaying a single instrument at the time?

Hello,
Wondering if there is any way to only Viewing / Displaying a single instrument at the time?

I have my key command set up to open vst instruments for editing (GUI) but if I open another one and then another one they keep stacking on top of each other…it gets messy really quick…so I just want to be able to open an instrument and at the same time close the ones already open…all with one click/key

thanks!

ESC should close the last opened plugin window.