On a windows computer that has filemaker 16 installed. Is it possible to hide the preview windows from the ? or the ability for users to switch between windows from the task bar. I can hide the window option in the filemaker menu with a custom menu, but is it possible to not allow users to switch between files from the task bar windows?
That is a Windows operating system feature and not a FileMaker feature.
There are ways to disable the thumbnail images showing by editing the Windows registry, but that is at your risk. A google for "windows 10 disable taskbar thumbnail preview" should point you in the right direction.