Change Sharing Only User settings on Mac
On your Mac, use Sharing Only User settings to create “sharing-only” users to share files and folders with others on your network. You can limit access to your shared information and computer. Sharing-only users can access shared files remotely, but can’t log in or change settings on the computer.
If you’re an administrator, you can reset the password and change the picture of a sharing-only user. Learn how to set up a Sharing Only user.
To change these settings, choose Apple menu 
in the sidebar, then click the Info button 
next to a sharing-only user on the right. (You may need to scroll down.)
Open Users & Groups settings for me
Option | Description | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Sharing-only user picture | Choose a user picture that represents the user. You can change the picture that appears next to your user name or another user’s name in the login window on your Mac. You can choose a photo from your photo library, take a new photo using the camera on your Mac, choose a Memoji or emoji, use initials in a monogram and more. When you choose a picture or other image for your user login picture, the selected image is also displayed for your Apple ID picture and for your My Card in Contacts. See Change a user’s login picture. | ||||||||||
Reset Password | Change the sharing-only user’s password and password hint. To use the Password Assistant, click the key | ||||||||||
Delete Account | Delete a user. (You may need to enter an administrator password.) See Delete a user or group. | ||||||||||
next to the New Password field. See To give a user permission to access your shared files or screen, you may need to change options in File Sharing, Screen Sharing or Remote Management settings. See Set up file sharing and Share the screen of another Mac.