After installing the plugin, all the items are not visible in the menu item of t

(publicpress permission) After installing the plugin, all the items are not visible in the menu item of the mobile view version. The sub items are visible one or two and the rest are not visible. When one item is visible, another item is not visible. Very bad situation. But in the web view, all the menus, submenus are visible beautifully. I have activated a different theme and the same problem. I have changed the WordPress version, but the problem is still there. (publicpress permission) I have installed many other versions of the plugin, but the problem is still there. And while the plugin is installed, the website becomes very slow. After installing it, the website becomes fast as before. Please fix the problem. Thank you