What OS are you using?

Ooorr… vscode with vim extensions/keyboard mappings. :)

You can export to pdf. Won’t be live, but it’s better than nothing!

Yeah once you get it set up it works everywhere you use Beyond. However, I think you need to use the webpage to design the homebrew

If you want to stick with DnD beyond, there’s an option to homebrew races and you can “homebrew” a 5e drow for personal use. Just copy the template for a similar race and you can adjust features. I will warn you though, the UI is pretty unintuitive so it might take some work