By default, the platform does not have this option. You can use the following CSS code to hide/remove Sign In and Sign Up buttons.

Please follow the steps below:

1. Go to BuddyBoss > Theme Options

2. Under Custom Codes, enable CSS

3. Append the following:

body:not(.logged-in) .bb-header-buttons,
body:not(.logged-in) .bb-login-section{
    display: none;

4. Save changes 

Note: Any modifications are considered as custom work already. Know more about our Support policy here: