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:

.activity .activity-header p a {    font-size: 16px; }
.activity .activity-header .activity-date a {    font-size: 12px; }

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/

Reference: https://prnt.sc/aRqhMYP8PG_p