Hi Duncan2018,
Thank you for reaching Microsoft Community.
Based on your description, you would like to confirm if the Surface Laptop 1stgen screen can be folded all the way back and use it as a tablet, correct? If yes, unlike the Surface Book series where you are able to detach the screen then connect it backwards and fold to keyboard (How to switch between modes on Surface Book - Microsoft Support), the Surface Laptop 1stgen is not capable of this. The Surface Laptop is basically just like a normal laptop where you can just open and close the lid. See: Surface Laptop (1st Gen) specs and features - Microsoft Support
Kind regards,
Marrion