The avatar symbol takes you to the personal settings. These can be managed independently by each user.
In the Home section, you can make adjustments to the specific display of information. To do this, select the elements you want to display on your homepage in the appropriate order. Depending on your authorizations, different elements are available for selection.
Go to the Personal data section and select the Profile picture menu item to add or change your profile picture.
As soon as you have added a picture, it replaces the avatar symbol and is displayed for linked data records and selection lists.