I know this comes up a lot, and Glowforge won’t give us a setting to disable it, so I went through the work to figure out a uBlock Origin rule to remove the Discord Chat.
In Chrome, go to Extensions → uBlock Origin → (gears icon) → My Filters Tab
And add this filter:
app.glowforge.com##div:has(> div:has(> div:has(> span:has-text(/Community Chat Preview/))))
Reload the web-app, and tada! No more community chat.
If you have network/DNS filters in place at your site, blocking “emerald.widgetbot.io” will also keep it from loading.