How do I stop the Dropbox desktop app from opening whenever I start my computer?

Hey MH19, I hope it's okay for me to jump in here as well.

Does the system tray window remain open even if you click out of it?

Can you also hover over the small Dropbox icon in the system tray and let us know the Dropbox app version you're using?

Thanks for your suggestion Nancy! Yes, I tried that and the problem does persist.

Hey MH19! If you follow Walter’s suggestion and turn the automatic startup Off and then On again, does the issue persist?

Thank you Walter! 

So the only way to disable the appearance of this interface is by disconnecting dropbox from startup completely? 

I've had dropbox connected to startup for years. It's only in the last couple months that this disruptive box appears. 

Hey MH19 - thanks for using Dropbox and happy Monday!

This is the Dropbox desktop app's interface, not a pop-up notification. If you'd like to, you can turn off the option that enables the app to start automatically whenever you boot your computer through the app's preferences, under the General tab. 

I hope this helps and please let me know if you have any follow-up questions.