By default, the platform does not have this option. You can use the following CSS code to prevent GIFs from being posted in the story.

Please follow the steps below:

1. Go to BuddyBoss > Theme Options

2. Under Custom Codes, enable CSS

3. Append the following:

li.blogs .activity-comments .post-elements-buttons-item.post-gif {
   display: none !important;
}

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/