Week Slicer Difference

Anonymous ,It is rolling week, You can see date 11 is included , Choose calendar week

In your calendar, you can week start as tuesday. But you will not be able to set that slicer based on the week start on Tuesday .

In you calendar you need to create a week rank on week start date and then calculate this week vs last and next week

Column

Week Rank = RANKX(all('Date'),'Date'[Week Start date],,ASC,Dense)

measures
This Week = CALCULATE(sum('Table'[Qty]), FILTER(ALL('Date'),'Date'[Week Rank]=max('Date'[Week Rank])))

Last Week = CALCULATE(sum('Table'[Qty]), FILTER(ALL('Date'),'Date'[Week Rank]=max('Date'[Week Rank])-1))

next Week = CALCULATE(sum('Table'[Qty]), FILTER(ALL('Date'),'Date'[Week Rank]=max('Date'[Week Rank])+1))

You need your own slicer for this week, last week etc

https://community.powerbi.com/t5/Desktop/Required-custom-date-Slicer-Last-7-days-last-15-days-last-30/m-p/1284966#M561629