You mean the BP adminbar 
Here’s how to have adminbar only in site where BP is installed.
http://buddydev.com/buddypress/remove-buddypress-admin-bar-from-all-blog-except-the-main-buddypress-site/
P.S. don’t forget to add the opening `<?php` at the top of the code
Thank you! Now I have the name right 
. I guess it was confusing to me that BuddyPress acts as a *network* activate/deactivate plugin, with settings that span all blogs on the network, in spite of that whole secondary blog installation I did following the instructions at https://codex.buddypress.org/getting-started/install-buddypress-on-a-secondary-blog/.
Did I somehow not perform that secondary blog installation correctly, or is this just how BuddyPress works?
Okay, now I do think my secondary blog installation is not working, as when I implemented the above via bp-custom.php, the admin bar was removed from *both* my main blog (where I don’t want it) and secondary blog (where I do want it).
I’m looking at the instructions for BP secondary blog installation, and the grammar of step 1 is a bit perplexing:
“In order to run Buddypress on a secondary blog, you should create a second blog and modify BuddyPress’ internal settings to set your new blog as the BP root blog. Next [what do they mean by “Next” here? I see what follows as the same instruction], define the ‘root’ blog you would like BuddyPress to reside at by adding the code snippet below to wp-config.php [this part is simple].”
The code I added to wp-config.php following instructions for WP network (multisite) and BP secondary blog is:
`define(‘WP_DEBUG’, false);
define(‘WP_ALLOW_MULTISITE’, true);
define( ‘MULTISITE’, true );
define( ‘SUBDOMAIN_INSTALL’, false );
$base = ‘[mysite]/’;
define( ‘DOMAIN_CURRENT_SITE’, ‘[myhost]’ );
define( ‘PATH_CURRENT_SITE’, ‘[mypath]’ );
define( ‘SITE_ID_CURRENT_SITE’, 1 );
define( ‘BLOG_ID_CURRENT_SITE’, 1 );
define ( ‘BP_ROOT_BLOG’, 2 );`
Where info in [] above has been replaced by literals in my case. The secondary blog is definitely #2; is there something else I’ve missed that (a) results in BP acting like a network plugin (vs. one restricted to the secondary blog) and (b) removes *all* admin bars from both blogs?
Thanks, all.
To diagnose the problem, I edited the code recommended in http://buddydev.com/buddypress/remove-buddypress-admin-bar-from-all-blog-except-the-main-buddypress-site/ by using a literal, i.e. replacing
`if($current_site->blog_id!=BP_ROOT_BLOG)`
with
`if($current_site->blog_id==n)`
With n = 1 (the main site, where I don’t want BuddyPress admin bar), the admin bar is disabled from *both* this site and the BuddyPress site (blog 2); with n = 2 (the BuddyPress blog), the admin bar is enabled for both!
This has confirmed that, in my installation, $current_site->blog_id is stuck at 1 no matter whether I’m on the main site or the BuddyPress subdirectory.
Again, I suspect my BuddyPress secondary blog installation is not working correctly, which may explain the above, but ideas quite welcome!
What version of WordPress and BuddyPress are you using, please?
Latest, I believe (WP 3.0.4, BP 1.2.7), installed from fresh download yesterday.
Can anyone please confirm the following from my previous requests: (a) that BuddyPress secondary blog installations on a WP multisite are not restricted to the secondary blog (i.e., a network-activate-only plugin), and more to the point, (b) how I can deactivate the admin bar from *only* the main site (note that by following the recommendations above, it’s removed from both sites, but this is due to blog_id being stuck at 1 no matter which blog I’m on). At this point I’ve gotten nowhere, and am seriously wondering whether BuddyPress is a good idea on a multisite.
As a final request, my BP account for this forum is set to receive email notifications, but I have yet to receive one email of a posting to this thread; this behavior does not happen with similar forums to which I’m subscribed.
