Task: I'm going to change phones, but first I would like to delete all of my Gmail data from my phone and sign out of the Gmail app. 
Steps:
Go back to the previous screen
Go back to the previous screen
Click on the back icon at the top left corner of the screen
Click on the menu icon at the top left corner of the screen
Click on the settings option
Click on the three dots at the top right corner of the screen
Click on the manage accounts
Click on the jane email id
Click on the remove account button
Click on the remove account button