السلام عليكم ورحمة الله وبركاته احسن الله إليكم و حفظكم الله استاذنا Is it recommended to use a sutrah during prayer in every situation even if one is certain that no one will pass in front of them? For example if you are alone at home.

Ustadh AbdulAziz al-Haqqan

It is a sunnah to put the sutrah.