My name is***** am sorry to hear that you are having this issue.
I will be glad to assist you with this.
The auto-rotation setting may be locked in one position. Here’s how to unlock it:
Step 1:With the Cover detached, swipe in from the right edge of the screen, or select Action center in the taskbar.
Step 2:If Rotation lock is undimmed, auto-rotation is locked. Select Rotation lock to unlock auto-rotation.
Rotation lock is undimmed when auto-rotation is locked. When auto-rotation is locked, the screen won’t rotate when you change the orientation of your Surface.
Reattach your Surface Typing Cover, fold it back, and check to see if the display rotates automatically when you turn your Surface.
- Screen rotation on Surface locks automatically when an attached Surface Typing Cover is in typing position.
- Folding back your Surface Typing Cover allows the screen to auto-rotate, unless auto-rotation on your Surface is locked.
- If your Surface screen is in portrait orientation when you attach your Surface Typing Cover or connect an external display, the screen will automatically rotate to landscape orientation, even when auto-rotation is locked.
If auto-rotation still isn't working after you unlock auto-rotation please let me know.