Looking for the same. Want to add custom UI panel.

I see a big movement towards v5, where they haven't even resolved the v4 problems yet.

They changed everything from v3 to v4, I can't even imagine what will come in v5.

So many changes and forgetting of something so basic and useful that this administrator customization would be.

I cannot understand why this has been removed from v4 since the ease of overriding built-in components to customize the rendering of each and every part of the UI was the main advantage of using a React based admin panel. In my understanding, v4 plugin system isn't as powerful and simple as the previous system was.

for example it looks kinda difficult to override the rendering of a relation ListItem, or to even change the way dates are rendered in list.

This feature in v3 made strapi a great tool for developers. I understand visual content builder etc are great for non-dev users, but please don't let strapi become the wordpress of Node (a good tool from the end-user point of view, and a nightmare for developers) 😅

Yes, i need to change the title of admin pages.