Some translations set each line of poetry further to the right than the rest of the text to make it easier to read. The ULB does this with the poetry in this chapter.
The first part of this chapter is probably a prophecy about the coming Messiah and not Isaiah because this was different than the message Isaiah delivered. (See: [[rc://en/tw/dict/bible/kt/christ]])
This chapter prophesies concerning a future time of peace and restoration. It is unlikely to have been fulfilled in Isaiah's day. (See: [[rc://en/tw/dict/bible/kt/restore]], [[rc://en/tw/dict/bible/kt/prophet]] and [[rc://en/tw/dict/bible/kt/fulfill]])