Using Classic Outlook on Windows for personal email, calendar, and contact management
Worked for me. Amending the text size under Settings > Accessibility > Text size seemed to trigger it to correct its-self.
<cut > from Rob Cook - The fix is too change the TEXT size under Settings>Accessibility>Text size, change it too something larger then click apply, then you can change it back too 100% size and click apply. All of your desktop icons will be normal again and the Ribbon in the apps like chrome, office, edge etc. will be fixed as well. Restart the app for changes too take effect or just restart the PC.
Thank you.