If you click on the profile picture in the upper right corner you will find the subsection “profile settings”. By clicking on “delete profile" in the left menu bar, your user account and all data stored in it will be deactivated and irrevocably deleted after 30 days. Access to your groups and projects will then no longer be possible.
Attention: If you are registered with the same user account on other portals, deleting will also affect these portals! If you want to leave a project or group, select "Leave" there without deleting your profile.