Many VST/AU hosts allow plugin interfaces to be pinned or kept open, in case the user is tweaking effects and/or multiple instruments plugins at once or wants to manipulate DAW controls without closing and repoeining the plugins.
In the case of Scaler, I am finding I love loading my own sounds directly, but every time I need to touch Scaler 3 the plugin window slams shut and I have to press the button to open it again and get reoriented on the plugin. I searched the manual and forums and did not find a way around this.
Would be great to have Scaler and a loaded plugin window both stay open, and give focus to follow mouse or control focus (which is how I believe most hosts handle when to pass HID inputs into the plugin vs the host).