Hi. My name is***** you for your question and the opportunity to assist.
To roll back to Windows 8.1 please follow these steps.
Click the Start button ( the Windows icon in the lower left corner of your screen)
and select Settings.
On the next page select Update & Security
From the vertical menu on the left select Recovery
Under Go Back to Windows 8.1
click Get Started
You'll be asked why you want to go back
Follow the prompts to return to Windows 8.1