and then return to using whatever settings you had on the camera before going to the C mode. Maybe this has always been true, but I didn't know it with my E-M10.3.
Except I thought one of the dumb things Oly did to Dumb down the E-10.3 was to remove ALL Mysets from the camera and the .3 doesn't have a "C" mode? Perhaps you are recalling your E-m10.1 or .2 (which were wicked smaht'r!)?