Hi @Spudduk ,
I am not sure if I understood your question correctly. What do you mean by showing only 3 days?
If you want to display the last 28 days of data when you select WTD, please try the following measure.
VAR _WTD =
SUM ( 'Table'[Value] ),
> TODAY () - 28
&& 'Calendar'[Date] <= TODAY ()
SWITCH ( SELECTEDVALUE ( Slicer[Site] ), "WTD", _WTD, SUM ( 'Table'[Value] ) )
If the problem is still not resolved, please provide detailed error information or the expected result you expect. Let me know immediately, looking forward to your reply.
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.