1. Display is the object of a preposition -- so it is not the subject. You is the subject.
2. What was?
3. Who are searching?
What is the subject of these sentences?
How much do you remember from that display?
You or display
Near the satellite model was a large picture of Jupiter.
Are you searching for the gift shop?
3 answers
So picture for the second one
And you for the last one?
And you for the last one?
Yes; both are right.