Ultimate Member customization. Redirect logged in users from the Login page.

um_login_redirect_url.php

<?php

// Redirect logged in users from the Login page to the page specified in the role setting “Set Custom Redirect URL”.
add_action( 'template_redirect', function() {
	if ( function_exists( 'um_is_core_page' ) && um_is_core_page( 'login' ) && is_user_logged_in() ) {
		if ( um_user( 'login_redirect_url' ) ) {
			$redirect_url = apply_filters( 'um_login_redirect_url', um_user( 'login_redirect_url' ), um_user( 'ID' ) );
		} else {
			$redirect_url = home_url();
		}
		exit( wp_safe_redirect( $redirect_url ) );
	}
} );

User Role settings:

Alternative solution: you can use a page content restriction settings with the code snippet in the article How to Restrict & Redirect Login Page.