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This is Step by step on what you should do
1.have mobile authentication setup
2.Go to settings
3.Steam in the top oeft
4.Settings
5.Then my account
6.Manage steam guard account security
7.Then scroll to the bottom
And deauthorise all devices
Means If they're still signed in
8.It'll sign them out too
You'll have to redo steam guard next time you turn on your PC but it'll kick everyone off.