What is a word for something that occupies one's entire field of vision? [closed]

Solution 1:

Panoramic is the first thing that comes to mind:

with a view of a wide area:

a wonderful panoramic view of the countryside
She used a panoramic camera and long exposures to capture the effects of fading light.

Solution 2:

In terms of the staircase filling your entire field of vision, it is, for you at that moment, no matter where you look, omnipresent:

[Merriam-Webster]
: present in all places at all times
// the museum's omnipresent security apparatus

Of course, this is relative. Nothing will always occupy your entire field of vision. Distance, in terms of both location and time, will make an objective difference.

But while you're present at the staircase:

The omnipresent marble staircase towers before you, presenting its perfection.