Tips on Customizing Music Press Pro

How to Hide Music Press Pro Admin Menus

function plt_hide_music_press_pro_menus() {
	//Hide "Music Press Pro".
	remove_menu_page('music_press');
	//Hide "Music Press Pro → All Songs".
	remove_submenu_page('music_press', 'edit.php?post_type=mp_song');
	//Hide "Music Press Pro → Genres".
	remove_submenu_page('music_press', 'edit.php?post_type=mp_genre');
	//Hide "Music Press Pro → Albums".
	remove_submenu_page('music_press', 'edit.php?post_type=mp_album');
	//Hide "Music Press Pro → Bands".
	remove_submenu_page('music_press', 'edit.php?post_type=mp_band');
	//Hide "Music Press Pro → Artists".
	remove_submenu_page('music_press', 'edit.php?post_type=mp_artist');
	//Hide "Music Press Pro → Free Add-ons".
	remove_submenu_page('music_press', 'music-add-ons');
	//Hide "Music Press Pro → ACL".
	remove_submenu_page('music_press', 'mp_roles');
	//Hide "Music Press Pro → Settings".
	remove_submenu_page('music_press', 'acf-options-settings');
}

add_action('admin_menu', 'plt_hide_music_press_pro_menus', 12);

Where do I put this code?

How to Hide Music Press Pro Meta Boxes

function plt_hide_music_press_pro_metaboxes() {
	$screen = get_current_screen();
	if ( !$screen ) {
		return;
	}

	//Hide the "Band avatar" meta box.
	remove_meta_box('postimagediv', $screen->id, 'side');
	//Hide the "Artist Data" meta box.
	remove_meta_box('acf_acf_artist-data', $screen->id, 'normal');
	//Hide the "Settings" meta box.
	remove_meta_box('acf_music_press_settings_page', $screen->id, 'normal');
	//Hide the "Song Data" meta box.
	remove_meta_box('acf_acf_album-data', $screen->id, 'normal');
	//Hide the "Song Data" meta box.
	remove_meta_box('acf_acf_band-data', $screen->id, 'normal');
	//Hide the "Song Data" meta box.
	remove_meta_box('acf_acf_genre-data', $screen->id, 'normal');
	//Hide the "Song Data" meta box.
	remove_meta_box('acf_acf_song-data', $screen->id, 'normal');
}

add_action('add_meta_boxes', 'plt_hide_music_press_pro_metaboxes', 20);