Hi ! Few weeks ago I wanted to upgrade to V4 but I did not succeed to override the files for my admin panel customisation in order to keep my V3 customization . And then I saw this post saying it is no longer possible.
After some research, I found some ways to customize my Admin Panel anyway :
- Configuration options : you can directly change all the translations, the logo, the favicon, the available locales, the theme, the tutorials and even the notification.
- The injection zone : you can create your own component and then put it directly in the Strapi admin panel
- Create your own plugin
If you are interested, I have tried to sum it all in an article (link here)