Hello @JeanneTarrants , when you select Color Properties, the Color Editor form appears, and at this point the rest of ArcGIS Pro does indeed appear to be "frozen". You can clear this form by pressing ESC (or OK, Cancel on the form itself). So it sounds like all this is happening for you, it's just that you can't see the form.
It could be hidden behind something, or right at the edge of the screen, or on a second screen etc. Try setting your PC's Screen Resolution to the minimum, then the maximum, to see if the Color Editor form does then appear for you.