How to move all pages while maintaining the structure in the WordPress menu?

Question

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There is a widget in which I need to display an arbitrary menu.
When creating an arbitrary menu, I came across the fact that everything is arranged as chaotically as possible, and with a large number of pages with deep nesting, it is problematic to create an adequate menu in manual mode.
How to migrate all pages while maintaining the nesting structure in the WordPress menu?

Answer 1

With a large number of menu items, the menu starts to hang (in the admin panel) or is not saved completely?) A familiar problem, put this plugin here and everything will be good Faster Appearance - Menus
You can’t automatically transfer the page structure to the admin panel, but if you don’t need to edit their order - you can get everything in code