afni.nimh.nih.gov

It's feasible -- e.g., to map one set of widgets while unmapping another, so only 1 is visible at a time -- something like this is done for the widgets below the 'Clusterize' menu. But you would only see one of the 'Define Overlay' panels at a time, which could be clumsy. But screen space would be saved -- which is important for a laptop, say.