Third board, the scientific name is free beat. You will find that there are no bars in this area.

There is no obvious division of strong and weak beats in this rhythm, and the control of its length is relatively free.

Of course, this does not mean that you can extend or shorten it at will. The approximate length is still available, depending on the length of the notes on the score. This is a quarter note, so you can't turn it into a half note.