BP Follow comes with a few internal filter switches you can use to enable / disable certain functionality.

To use these switches, add the snippet in question to your theme's functions.php or wp-content/plugins/bp-custom.php.

add_filter( 'bp_follow_show_activity_subnav', '__return_false' );

add_filter( 'bp_follow_allow_ajax_on_follow_pages', '__return_false' );