Task: I have by mistake signed in to my official email, dbwscratch.test.id8@gmail.com, so sign out of my official ID from my calendar app.
Steps:
Go back to the previous page.
Go back to the previous page.
click on the profile icon at the top right corner of the screen.
Click on Manage accounts on this device, which is the last option in the list.
Click on the id-dbwscratch.test.id8@gmail.com , which is fifth option in the list.
Click on the tab Remove account.
click on the Remove account at the bottom right corner of the box displayed on the screen.