Hi WalterMagill
My name is Fernando. I am an Independent Advisor. I am here to guide you with your GMail Inbox question.
If you are retrieving your GMail from the web-browser, the GMail upgrade to Windows 10 and GMail are independent of each other. It might have coincided with your upgrade. More than likely, you need to go into your GMail account and reorganize your folders.
Here is a link that might help guide you on organizing your GMail folders.
https://business.tutsplus.com/tutorials/how-to-...
I hope this helps. Feel free to ask me any questions and let me know how it goes.
Respectfully,
Fernando Y.
Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.