Dashboard++ CSS –

Hmm. This snippet is working for me in Reading view using the Minimal theme (Readable Line Length → ON).

CleanShot 2023-09-07 at 03.56.38


If you can’t get that snippet working (and with it off), Minimal has Helper classes - Minimal Documentation 36 that you could use here. In your YAML, include the max cssclass:

Try:

---
cssclasses:
  - dashboard
  - max
---

This will change the width of Source, Live Preview, and Reading modes, but as it’s a dashboard note, it could be workable.