Settings → Account lists every browser and app signed in to your account under Security, with roughly where each one is. The one you are using is marked This device.
- Press Sign out beside a device to end that sign-in.
- Press Sign out everywhere else to end every sign-in except this one.
A sign-in lasts up to a year, and ends by itself after 90 days without use.
More in account and security
Turn on two-factor sign-in
Use an authenticator app, keep your recovery codes, and know when a code is asked for.
Change your email address or password
Both are in Settings, and a new email address is confirmed with a code.
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