By default BuddyBoss Theme/Platform has no built-in feature to hide the WP language switcher and achieving this will require custom work as this will change the look and functional aspect of the product.

We can resolve this by applying a function code following this article here: https://make.wordpress.org/core/2021/12/20/introducing-new-language-switcher-on-the-login-screen-in-wp-5-9/ 

1. Go to Appearance > Theme Editor.

2. Under Select theme to edit, choose (BuddyBoss Child/whatever theme is active), then click Select.

3. Below Theme Files, select Theme Functions (functions.php).

4. Append the code just before the closing PHP tag “?>”:

add_filter( 'login_display_language_dropdown', '__return_false' );

Note: Any modifications are considered as custom work already. Know more about our Support Policy here: https://www.buddyboss.com/support-policy/