How to stop the upgrade notifications on my Dropbox online?

I've had the Dropbox Plus plan for over 10 years and have been more or less happy with the service. My account is about ⅓ full at any given time. Most of the time I use the desktop app (Mac OS 15.6.1, dropbox v.237.4.5655) which syncs my files across 3 devices and between several apps.

I don't sync all files to the desktop obviously, so sometimes I have to log in to the web version to see all files. Dropbox bombards me with requests to upgrade to business level and work with "my team". not just once or twice, but EVERY TIME I log in. That and the giant green button at the top a different color from everything else on the page constantly begging me to upgrade... aaaarrrrrghhhhh. 

Is the desktop site intended to drive away non-corporate customers? I've done lots of projects with other people and the whole point of using Dropbox was the ease of passing files between all our different freelance accounts. It's out-of-proportion annoying. 

I have scoured all the notification and account settings and found nothing. Please how can I stop it?

thanks!