How to Hide Fluent Boards - Project Management Tool Admin Menus

function plt_hide_fluent_boards_menus() {
	//Hide "Tools → Scheduled Actions".
	remove_submenu_page('tools.php', 'action-scheduler');

	//Hide "Fluent Boards".
	remove_menu_page('fluent-boards');
	//Hide "Fluent Boards → Dashboard".
	remove_submenu_page('fluent-boards', 'fluent-boards');
	//Hide "Fluent Boards → Boards".
	remove_submenu_page('fluent-boards', 'fluent-boards#/boards');
	//Hide "Fluent Boards → Reports".
	remove_submenu_page('fluent-boards', 'fluent-boards#/reports');
	//Hide "Fluent Boards → Settings".
	remove_submenu_page('fluent-boards', 'fluent-boards#/settings/members-role');
}

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

Where do I put this code?