By default, the platform does not have the option to always show the Comment Bar on activity posts. You can use the following CSS code.
Please follow the steps below:
1. Go to BuddyBoss > Theme Options. https://prnt.sc/8xGUJCmTCuTm
2. Under Custom Codes, enable CSS. https://prnt.sc/CL1Pkpe6W590
3. Append the CSS code. https://prnt.sc/Jk5_hAZ5__2R
.activity-comments form { display: block !important; }
4. Save changes.
Screenshots
Without code

With code
