In certain cases you will need to remove a gmail account from your child's phone. To remove it kindly follow these steps:
1. Open parent app
2. Swipe up on the child card
3. Click top left corner (three dots)
4. Choose Child Settings
5. Toggle on Grant access to full settings for an hour
6. Click check mark in top right corner
Switch to child phone:
1. Click top left corner
2. In the menu choose system settings
3. Choose USERS and ACCOUNTS
4. Find the account you want to remove and click it.
5. Then choose remove.