Hi Marilyn,
The pop-up window when switching between apps is an interface designed for touchscreen devices running on Windows 8.1 and this will still appear even if you’re using a desktop. If you prefer to have this option to be disabled, here are the steps:
- From Search option, go to PC settings.
- Click on PC and devices.
- Go and click on Corners & Edges.
- Under the App switching option, switch to Off all the buttons., then check the result after.
We’re just here if you need further help.