Why on early Christian crosses we can see enlarged ends?

1. Why did they enlarge the ends of the crosses in early time from the time of Constantine, since we see coins with such cross? Thanks in advance. [Amazing colorful mosaics at the basilica of Almyrida, of the early byzantine era (6th century bC), in Apokoronas, Crete, Greece.](https://www.alamy.com/amazing-colorful-mosaics-at-the-basilica-of-almyrida-of-the-early-byzantine-era-6th-century-bc-in-apokoronas-crete-greece-image568479165.html) [Croix Christianisme (Wikipedia)](https://fr.wikipedia.org/wiki/Croix_(christianisme)) [The Christogram in the mosaic may look like a cross, but it's actually more like a "chi rho" symbol, which puts together the first two captial letters in the Greek word for Christ.](https://www.livescience.com/42761-ancient-church-mosaics-uncovered-israel.html) https://www.smithsonianmag.com/smart-news/see-the-greek-biblical-inscription-embedded-in-an-ancient-mosaic-floor-discovered-in-israel-180985849/ https://wowcappadocia.com/aidesim-mosaic-basilica.html https://www.dailysabah.com/history/2017/03/03/1600-year-old-byzantine-mosaics-in-kilis-to-attract-tourists [A Church Beyond Compare - The Nea Church, or the Basilica of Saint Mary the New in Jerusalem (543-614)](https://www.johnsanidopoulos.com/2017/11/a-church-beyond-compare-nea-church-or.html) https://www.wildwinds.com/coins/ric/constantine/t.html I mean this - the enlarged ends of the crosses. It looks like the ankh and the equal sided cross from the near east have enlarged ends, not exactly sure why, there is similarity. https://www.pinterest.com/pin/353884483203978736/ https://www.wildwinds.com/coins/ric/constantine/t.html How can there be sol invictus with Christian cross? [Ancient Numismatic Coins](http://numismatics.org/ocre/id/ric.7.tic.45?lang=hu)