Why does this button not exist in the Armoury Chest?

[Hitsuzen]

Fairly certain those crescentts are ascending and descending.
Not sure exactly which offhand, but it's to user preference anyway.

My French is pretty artificial being learned from university (boring required bs lol I should have chosen to learn Japanese) and not native, so croissant could be a double entendre, but I learned it as crescent as in the crescent rolls you can buy from a bakery or donut shop (hence croissants); I say this because ascending and descending make more sense;

However, I know descendre is the verb "to descend" and monter is the verb "to ascend".