I'm a big fan of Material UI and I've been using it for about 2 years now, but building my product I felt like I need something more IDE friendly, or studio-ish.
I canvased the internet and found a newcomer that looks very promising called Mantine.
It's still being developed actively but already has a solid base and various hooks that make building UIs easy.
The devs are very helpful on the Discord channel and the contributors are passionate about building something cool.
I definitely recommend!