Condense the icon spacing on the Quick Access toolbar
I understand that while Excel 2016 has been upgraded to allow customization of the Quick Access toolbar, the icon spacing only allows about half the number as Excel 2011. A couple of months ago I cancelled my Office365 subscription after discovering that the Quick Access toolbar couldn't be customized. I won't be a subscriber until I learn that this productivity problem is solved.
This is the problem I was also trying to solve. I will not boycott Excel, but I was planning to suggest a significantly more compact Quick Launch Toolbal icons for my MS Excel 2019.
Greg Saunders commented
I agree that this is a major hassle and unnecessary. MS probably forgot about the power users in this "upgrade". They nicely allow for a tablet capability, but that does not solve the problem for big Excel users.