If the customer requested how to hide comments on the Activity Feed page. You can provide this Function code below.
Note: Make sure to have a complete site backup before proceeding
1. Go to Appearance > Theme Editor.
2. Under Select theme to edit, choose (BuddyBoss Child/whatever theme is active), then click Select.
3. Below Theme Files, select Theme Functions (functions.php).
4. Append the code just before the closing PHP tag “?>”:
add_filter( 'bp_activity_can_comment', false);
5. Click Update File to save the changes.
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Reference: