Here is how to disable fast user switching in Windows 10.
Just read this post fromMiniTool, you might find 2 effective methods.
Although this feature doesnt force other users to sign out, it brings some disadvantages.

In the following part, we show you two methods including editing Windows Registry and Local Group Policy.
Step 2: Typeregeditand pressEnter.
Step 5: Double-hit the created key and set its value to1.

Step 6: ClickOKand reboot your machine, the fast user switching feature is disabled.
Here two simple methods for Windows 10 Pro upgrade are offered to you.
Step 1: Inputgpedit.mscto theRunwindow and clickOK.
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Step 2: Go toComputer Configuration > Administrative Templates > System > Logon.
Step 3: Go to the right side and locateHide entry points for Fast User Switching.
Step 4: Double-click this item and chooseEnabledin the pop-up window.

Bottom Line
How to disable fast user switching in Windows 10?
Now after reading this post, you know 2 methods.
Just choose one based on your actual situations to disable this feature when there is a need.