Slicer order

Vanessa250919 

I suggest you create another field (e.g. Day No), using Power Query, where the day names will have sequential numbers
e.g. Monday = 1, Tuesday = 2, Wednesday = 3... etc

Then sort the DayName field by DayNo.

https://docs.microsoft.com/en-us/power-bi/create-reports/desktop-sort-by-column