Hi,
Sorry for my late reaction.
I followed the steps you proposed, but didn't get anything about %. I only see a line between the words 'smaller' and 'bigger'. When I click on 'Magnifying glass' I get a window that suggests that the size is set to 100%. Is that what you meant?
I hesitate to change something in this matter, because the risk is that I must reorganize the buttons on my desktop. I can live with another oddity on my PC...
Jaap