View W10 Security Logs

• Open Event Viewer
• Select Windows Logs > Security

View Only Login Or Logout Events

• Select filter 'current log' in the menu on the left
• In the Event IDs box enter the following codes which indicate logon & logoff events: 4647 & 4648
• Select OK

You should now only see a list of logon/logoff events. Double select on one to view more details including the account name which logged in or out.