I have 1000's of au files syncing to my computer

Hi there,
Not sure what’s going on but I have 1000’s of files syncing to my Dropbox and pc. I’ve only opened Audacity a few times and am mostly cleaning up audio for a slideshow presentation.
I tried searching but nothing comes up - I’ve attached a screenshot of my db, but I can scroll several times over and it just keeps on going!! I need to use other files on my computer that will also sync to db…PLEASE HELP!!
AU - Sync.jpg

Don’t use dropbox for Audacity projects.

An Audacity project has a “project file” (“.aup”) and a “_data” folder. Inside the “_data” folder is the project’s audio data - a large project may contain thousands of “.au” files.