you can also put the panel (and any other objects you want stabilized) into the Background, then choose View–>Lock Background. Now they won’t be editable or selectable unless you choose Unlock Background.
just make one that you like and duplicate it (alt or option-drag). Or if you have lots already, select them all and use the Inspector, it will change them all at once. Same with any group of objects of the same type, and partially true with multiple types of objects (only the shared attributes will be available in the Inspector).