This tutorial will show you how to sign out of your Microsoft account everywhere all at once.
If you think someone might have unauthorized access to your account, Microsoft can protect you by signing you out from all of your trusted devices.
Within 24 hours, you will be signed out of browsers, apps and anywhere else your account is used to sign in, except an Xbox console.
Reference:
How to sign out of your Microsoft account everywhere - Microsoft Support

Here's How:
1 Go to the Advanced security options site at Microsoft for your Microsoft account, and sign in to your Microsoft account if not already.
2 Scroll down to the Sign out everywhere section, and click/tap on the Sign out everywhere link. (see screenshot below)
3 Click/tap on Sign out to confirm. (see screenshot below)
That's it,
Shawn Brink
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