You are experiencing such display:
This issue is related to the use of the fast user switching mode, which you can disable by following this procedure : https://www.technipages.com/windows-10-enable-or-disable-fast-user-switching
If this issue occurs when a session is idle for sometime, you need to check your screen lock settings.
This can be tuned using GPO as well.
![](https://s3.amazonaws.com/cdn.freshdesk.com/data/helpdesk/attachments/production/2043033502360/original/l7ylSH-SDZeGOIIOZEj1vA-F0zweK3W6_Q.png?1563184826)