And forgot to log out.
Try https://www.geek.com/android/geek-101-how-to-sign-out-of-chrome-on-all-devices-1564884/ and similar ideas.
I visit my lady friend at the weekends. Usually I take my laptop to read my incoming emails (gmail via Foxtrot).
But on odd occasions I have used her laptop.
She is now receiving copies of my incoming emails addressed to her on her laptop. At some future date this could be an embarrassment.
I've obviously done something wrong. What could I have done and how do I rectify it ?
Many thanks for your advice.