Force a default filter into drill through

You could try creating a calculation group and applying that as a filter on the drill through page. The calculation item could check for the presence of a filter on the date table and if one doesn't exist then apply the filter you need. Something like

Apply default filter =
IF (
    NOT ISFILTERED ( 'Date' ),
    CALCULATE ( SELECTEDMEASURE (), 'Date'[Date] = TODAY () ),
    SELECTEDMEASURE ()
)

Hi CeleneBenjamin,

Thank you for reaching out to the Microsoft Fabric Forum Community.

We tried to reproduce the scenario. Please refer to the attached PBIX file for details.

Thank you.