unable to click them back on at all?

are all your limbs giving you problems? Or only the ones on the left hand side of the list? Depending on the width of your screen/device type, the toggles can end up "under" the preview pane and be very difficult to toggle. Sometimes this can be helped by sliding your mouse very slowly so you catch the very edge of the toggle switch. Also you don't have to click the white button, as long as the cursor is touching any part of the toggle area, it will work.

Either that, or its a cache issue. I can see your toes sticking out the side of your shoe.