Propose having hot buttons to preselect total number of thumbnails per row in Library grid mode. This would speed up zooming in and out of photos grid for a better view for culling purposes (ie marking colors, flag). At times you want see the forest and at times you need to have a quick view to reveal out of focus photos which are not obvious in forest view. The present slider is at times slow to respond. On the 4K display the max without side panels display its 24. Propose to have 5, 10, 15, 20 quick buttons.
Attached is an approximate visual representation
