By default, the platform does not have this option to hide the Search Bar in Mobile View. You can use the following CSS code to achieve this on your site. 

Please follow the steps below:

1. Go to BuddyBoss > Theme Options

2. Under Custom Codes, enable CSS

3. Append the following:

@media (max-width: 768px) {

.dir-search.activity-search.bp-search {

    display: none;

}

}

4. Save changes.

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

Without the Code: 

With the Code: