We’re working on this, see this thread for more information and useful links:
https://community.brave.com/t/brave-ui-customization-still-lacking/33474
If you’d like to download/use our Developer build, we’ve fixed our issue which blocked users from using new tab page extensions - so if you don’t want to wait for our own design changes to the new tab page (or don’t want to do them yourself). This may at least temporarily resolve your issues:
