Allow more than one audio plugin GUI open at a time or create an audio GUI rack
If I have multiple audio plugins on a track. Every time I adjust a setting on one plugin GUI the other GUI closes. DAW Software leaves all GUIs open until they are closed. Alternately, you could have multiple GUIs open in a rack so that the rack could be opened and closed as need. This would help reduce clutter.

-
Stefan Wiegand commented
In the upper right corner of the effect settings window there is a button.
It toggles the "targeted" mode for this window.
If targeted, opening another effect will re-use this window, otherwise, a new window is opened.
Hope this helps. -
AdminMatt Stegner (Admin, Adobe DVA) commented
Hi Dave,
I think what you are looking for is the "Targeted" button in the upper right corner of the effects windows. It is a small box with an x in it. When you click on this, it will turn blue, and that effect window will stay open until you close it, and new effects window will be put into the shared effect window. This is how certain DAW's handle floating effects windows.
Let me know if this is not what you are asking for.