Color Panel keeps resizing, I haven't been able to tell what triggers it but I keep it above my Layers panel and the spectrum box will eventually get large enough to half my layers panel.
I suspect your hitting tab and f to hide panels and cycle full screen modes with panels docked to the app frame. A workaround is to tug the panels off the edge so they're floating.
It's May 2022 and I'm just noticing this myself. I guess it never got fixed?
Really annoying as I also prefer to have my Swatches and Layers docked on the right of my screen but prefer to have Layers take up as much as possible.
Same! It's October. It's driving me nuts - I'm adjusting the color panel size constantly because it expands anytime I adjust something in the properties tab below.