Hi.
 
I don’t think you can change the theme in uPyCraft IDE.
 
I’m currently updating our MicroPython eBook, and my first IDE recommendation now is Mu Editor.
It is simple to use, intuitive, and works pretty well so far.
Try it out:https://codewith.mu/
 
It has a tool to flash micropython firmware, so you don’t have to do it using the terminal and esptool, and it automatically detects the boards, you don’t need to select any com port or something.
 
The eBook will be updated soon, and I’ll create a tutorial about Mu Editor for the blog too.
 
Regards,
Sara