This will help you to update / add/ remove the course access method for Dozent LMS, FYI: Dozent LMS is a Modern, Scalable Learning Management System Plugin For WordPress

dozent-lms-modify-course-access-methods.php

//Add this code to your course themes/activated-theme/functions.php

// Remove access methods

add_filter( 'dozent_course_access_methods', 'remove_dozent_course_access_methods' );

if ( ! function_exists( 'remove_dozent_course_access_methods' ) ) {
	function remove_dozent_course_access_methods( $methods ){

		if ( isset( $methods[ 'public' ] ) ) {
			unset( $methods[ 'public' ] );
		}

		if ( isset( $methods[ 'protected' ] ) ) {
			unset( $methods[ 'protected' ] );
		}

		return $methods;
	}
}

// Add course methods

add_filter( 'dozent_course_access_methods', 'add_dozent_course_access_methods' );

if ( ! function_exists( 'add_dozent_course_access_methods' ) ) {
	function add_dozent_course_access_methods( $methods ){

	$methods['extra_method'] = [
			'label'          => __( 'Extra Method', 'textdomain' ),
			'description'    => __( 'Extra access method for this course', 'textdomain' ),
			'inner_callback' => 'extra_method_callback_function',
			//add function and write some html to show when user will select this method
		];

		return $methods;
	}
}

// Edit Course methods lebel or description


add_filter( 'dozent_course_access_methods', 'add_dozent_course_access_methods' );

if ( ! function_exists( 'add_dozent_course_access_methods' ) ) {
	function add_dozent_course_access_methods( $methods ){

		$methods['protected'][ 'label' ] = __( 'Updated Protected', 'textdomain' );
		$methods['protected'][ 'description' ] = __( 'Updated description', 'textdomain' );

		return $methods;
	}
}