How do I sign out?
Quick answer: Click your email address in the top-right corner of any page, then click Sign out at the bottom of the menu. You return to the sign-in page.
Steps
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Click your email address in the top-right of the navigation bar. On a phone, tap the arrow icon there.
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Click Sign out at the bottom of the menu.

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You're signed out and back on the sign-in page.
Switching accounts
Sign out first, then sign in with the other account. With Google or Microsoft, pick the right account in the account chooser — your browser may remember the last one.
On the /start page, the Sign out link sits next to Results go to your email.