How to uninstall Windows app

I had a server with Nextcloud and Nextcloud app on my local machine with Win 10. Server is gone and I try to uninstall Nextcloud app on my pc. I found Nextcloud in start menu click uninstall then uninstall. So Nextcloud icon is gone but it still shows me a popups with messages from somewhere so I would like to know how to uninstall Windows app completely.

Thank you.