Without an apply button, ArcGIS Pro is re-drawing the map for every symbology attribute change. Example: Raster - Display Background Value - This part of the symbology pane has a check box and 3 fields to set the RGB values you want the change the display for. Changing this sends 4 redraw requests to the map despite only 1 needing to be done. I would prefer to have to click apply in all scenarios over having to deal with multiple redraws with no purpose.
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