Open your Google Account page at myaccount.google.com
Sign in if prompted
Go to Security
Under Your devices, select Manage all devices
Choose the device you want to log out from
Click Sign out
Confirm the action if asked
Repeat for any other devices you want to remove
Change your Google password if you want to sign out from most devices at once
Review recent security activity for any unfamiliar devices
Enable 2-Step Verification for added account security