Enable sync in Google Calendar app settings

How to enable syncing in the Google Calendar app for calendars that don't appear in the app's main menu, but work normally in a browser.

Our advanced calendar tools:

Sheets2GCal (Sheets add-on)
Sheets2GCal is designed for advanced Google Calendar management using spreadsheets. Create or import events into a spreadsheet, edit them in the sheet and export the changes to Google Calendar, or edit them in Google Calendar and import the changes back into Google Sheets.

More information: https://www.sheets2gcal.com/help
https://workspace.google.com/marketplace/app/sheets2gcal/137564231775

GCalToolkit (desktop software)
Take control of Google Calendar with GCalToolkit Power Tools for OSX, Windows and Linux: https://www.gcaltoolkit.com

GCalExtras (Calendar add-on)
GCalExtras integrates with Google Calendar to provide additional features such as saving/loading calendar groups, mass copying/editing a range of events, easy access to location text event and storage of private notes associated with individual events.

More information: https://www.sheets2gcal.com/gcalextras/
https://workspace.google.com/marketplace/app/gcalextras/338335660766

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