Hi @Anonymous ,
I did a simple demo for you.
1\ This is my datasource.

2\ Add 2 datepicker control 'DatePicker1' and 'DatePicker2'.
Add a gallery control and set its Items property to:
Filter(LIST148,Date_Column>=DatePicker1.SelectedDate&&Date_Column<=DatePicker2.SelectedDate)

3\ Add a button control and set its onselect property to:
Set(Last_Week_End,DateAdd(Today(),-Weekday(Today()),Days));Set(Last_Week_Start,DateAdd(Today(),-Weekday(Today())-6,Days))
//Create 2 variables
Set gallery's Items property to:
Filter(LIST148,Date_Column>=Last_Week_Start&&Date_Column<=Last_Week_End)
// Show last week

Best Regards,
Wearsky
If my post helps, then please consider Accept it as the solution to help others. Thanks.