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Hi @simpleone,

you can actually only hide xprofile fields. Hiding field groups is not possible, due to a bug.
But it is corrected for 2.1 and you’ll find a patch on the trac.

You can already apply the patch to 2.0.2 bp-xprofile-classes.php and the above snippet will work. Add it to bp-custom.php or theme’s functions.php

To hide an xprofile group, use bp_parse_args like this:

function bpfr_make_profile_tab_members_only( $retval ) {
	// hide to non members
	if( !is_user_logged_in() ) {
           // exlude groups, separated by comma
		$retval['exclude_groups'] = '4,5';
           // exclude fields, separated by comma
       		$retval['exclude_fields'] = '1,39';			
	} 
	return $retval;	
}
add_filter( 'bp_after_has_profile_parse_args', 'bpfr_make_profile_tab_members_only' );

How to work with versionned file from SVN is too long to explain in a forum topic. Google around this subject or see on WP codex. But it is not necessary to learn that for just this modification.
In your (this) case, it is very simple to do in fact.

As you can see, the patch contains code, highlighted in red and green in regards of the line numbers he belongs to.

The red code is the actual code (the one who should be modified)
and the green code is the new one who replace the red line.

To do it correctly, you check the line number on the patch and read attentively the code. Not for learning it, but to have a visual memory of it. 😉

You do the same in your file, with help of a text editor like notepad+ which shows your file line numbers.
You erase the red part and you copy/paste the green part at the same place.

When finished, your file must only contain the green part. Or to avoid any error, you can comment the old code and add the new code, so you could revert back if needed. Or you can also made a copy and put it in a safe place before modifying the original file.

A patch also contains code who isn’t highlighted before and after the modified lines. So you can easyly check what you do and where all this happens.

Hope to be clear.

I tested the snippet and applied the patch to 2.0.2 and it works. So i guess you did something wrong. 🙁

BP 2.1 is expected in 12 days !

Just realized that you wanted to hide xprofile groups on the profile edit page !

Add bp_is_profile_edit() to the if

if( is_user_logged_in() && bp_is_profile_edit() )

FYI:
The original file is in buddypress/bp-xprofile/bp-xprofile-classes.php (BP 2.0.2)
The patched code is here.
The part you mention is for developpers unit test. You have nothing to do with that. 😉

Here you can download a copy of the patched file I use. You put it here:
wp-content/plugins/buddypress/bp-xprofile/
And here the code to add into bp-custom.php

function bpfr_hide_profile_field_group( $retval ) {
	// hide profile group to members when on profile edit
	if( is_user_logged_in() && bp_is_profile_edit() ) {
           // exlude groups, separated by comma
		$retval['exclude_groups'] = '6';          		
	} 
	return $retval;	
}
add_filter( 'bp_after_has_profile_parse_args', 'bpfr_hide_profile_field_group' );

Would it matter that I have my group_order (i.e., the order in which my field groups are displayed) arranged in a specific order?

No !
Anyway, i was wrong myself. Apologize. My snippet hides groups from viewing, not from editing. But you can get another trick on this post. And this one works realy. 😉