What is the ruling on prayer if the sutrah is inclined, and does the ruling differ if its inclination does not affect its legally required height, or if it affects it by making it less in height, or if it is vertical but inclined towards the worshiper while maintaining the required height?

The Sunnah is for the praying person's sutra (barrier) to be upright, at a height of two-thirds of a cubit or more, like the back of a saddle. There is no harm in it being inclined in any direction, as the purpose is to achieve the sutra, and it is not restricted to a specific measure, even though two-thirds of a cubit or more is preferable. It is permissible to use anything as a sutra, even an arrow, a thread, the edge of a prayer rug, or even a line drawn on the ground if one does not find anything to set up.