display

When you upload a video to your channel, you’ll also need to include metadata to give viewers more information and ensure your videos display in relevant search terms.

Does display mean appear here?

It means "are displayed". It is a use of the middle voice.

and [so as to] ensure [that] your videos [are] display[ed] in [the list of results that are given when someone enters] relevant search terms [in a search engine].

See OUPblog "What is the middle voice?"

Beyond the active and passive, English also has something known as the middle voice, sometimes more fancily called “the mediopassive.” The middle voice occurs when the subject of the sentence is the noun or noun phrase that is acted upon, but there are none of the trappings of the passive, like the auxiliary be-verb and the by-phrase. We find the middle voice in sentences like these:

Her novels sell well.
Some people photograph easily.

Thanks for help 👁 Smile :)
what 'acted upon' means there?

meramli said:

Thanks for help 👁 Smile :)
what does 'acted upon' mean? The middle voice occurs when the subject of the sentence is the noun or noun phrase that is acted upon,

"The middle voice occurs when the verb's action operates on the subject of the sentence [and not the object, if there is one."]

Compare
I sold the house - indicative - I do the action of "to sell" and the action of "to sell" affects the house.
The house was sold by me - passive - "me" does the action of "to sell" and the action of "to sell" affects the house.
The house sold. - middle voice - "The house" does not do the action of "to sell" but the action of "to sell" affects the house.

Thank you so much