Short answer
HubSpot's KB: removing the extension or add-in takes away HubSpot Sales features in your inbox, but you can still log emails with your BCC address. After removing the Chrome extension, clear the cache. The Windows tray app was sunset on Jan. 25, 2024.
1. In HubSpot
The relevant screen in my demo portal.
2. Worth knowing
Reinstalling is often the fix for a broken extension.
3. Related
Chrome extension troubleshooting.