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:

.comment-author .avatar, .post-author-details .avatar, .entry-content-wrap .avatar, img.avatar {
   border-radius:0
   }

4. Save changes.

Note: Any modifications are considered as custom work already. Know more about our Support policy here: https://www.buddyboss.com/support-policy/