Add the switch user button

1. Press the Windows + R keys to open the Run dialog, type gpedit.msc, and press Enter. NOTE: This file is located at C:\Windows\System32\gpedit.msc.

2. If prompted by UAC, click on Yes.

3. You can now set and manage the Local Group Policies on your computer to how you want them.

In the left pane, click on to expand Computer Configuration, Administrative Templates, System, and Logon. (See screenshot below)

In the right pane, right click on Hide entry points for Fast User Switching and click on Edit. (See screenshot above)

https://www.sevenforums.com/tutorials/3652-local-group-policy-editor-open.html
https://www.sevenforums.com/tutorials/63025-ctrl-alt-del-start-menu-add-remove-switch-user.html