By default, the platform does not have this option. You can use the following CSS code.
Please follow the steps below:
1. Go to BuddyBoss > Theme Options
2. Under Custom Codes, enable CSS
3. Append the following:
#bbpress-forums#bbpress-forums .bs-forums-items .item-avatar { display: none; }
4. Save changes.
Screenshots
Without code
With code