To set your expectations, the option to hide/disable the last activity time is not available and requires custom.

If the requirement is on top priority for your website, you will have to connect with your personal developer to make the required changes.

As a workaround, you may use the below CSS code. 

1. Go to BuddyBoss > Theme Options

2. Under Custom Codes, enable CSS

3. Append the following:

{ display: none;

4. Save changes 

Note: Any CSS modifications are considered custom work already. 

Know more about our Support Policy here: