DNA is arranged during mitotic cell division which has 5 stages:
Interphase
Prophase
Metaphase
Anaphase
Telophase
DNA is in its uncondensed form during interphase. It would appear loose within the nucleus. At this point, DNA can be called chromatin. When cell soon enters prophase, DNA becomes condensed, which forms the chromosomes and are visible at this point. DNA stays condensed all the way till Anaphase. Uncondensed form of DNA makes its reappearance towards the end of Telophase and the cycle continues.