Ah, I see.
That issue with labels overflowing their containers appears to be an issue in Mermaid, and occurs for me with their in their own example docs and live editor:
https://mermaid.js.org/syntax/gantt.html#syntax
I don’t believe that’s anything I’ll be able to fix in Deepdwn unfortunately. I’ll keep an eye out for fixes, though, and see if there’s anything that can be done to make it less bad.