Content manager override in v4

I wish to extend the admin panel so I can create categories for my API’s. I have over 20 endpoints and getting hard to manage. is there a way to do this in v4? in V3 you could copy the left menu from the node_modules and override it in the extensions folder but that is no longer possible. Is there a way to achieve changing the way content manager and content-type-builder looks and work?

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