Google Calendar Accounts:

On your computer, visit Google Calendar. If you already have a Google Account, sign in. If you don't have one yet, click Create an account. Once you sign in, you'll be taken to Google Calendar. To change any of your settings, go to the top right corner and click Account to enable or Disabled, either you can delete the account if you want. 

Short Direction: {HubmoeLMS> Dashboard> System Setting> Google Calendar> Accounts> Google Calendar Settings> Google Accounts> Add Account> Enable> Disable/ Delete.} 

You can active or inactive any Gmail account for google calendar, also one thing from here is to inform you that only one account can be enabled. 

1- Accounts

2- Google Calendar Settings

3- Google Accounts

4- Add Account

5- Enable

6- Disable/ Delete any of the accounts that you already connected.