Go to the session that you want to personalise. Navigate to the top right until you see a cog icon. Click on it and go to Personalize Form.

Make sure Display Hidden Objects is checked.

Green highlighted means it's hidden and non green highlighted is already visible on your session. 

To unhide the column that you want, select the column and then uncheck "Hidden". To hide the column that you don't want to see, select the column and then check "Hidden"

After you're done with your personalisation, click on Save and Exit and then restart the session.