DAX Create Dynamic Virtual Table - Based on Slicer

Hi

I want to be able to create Virtual Table which is dependant on a slicer.
If Region slicer is...
being used:           Return the entire table
NOT being used:   Return a Summarized version of table (without the region field)

Entire table

CustAlias |Region    |Month          |Value

Summarized version of table (with region field removed)

I tried using....
IF  ISFILTERED(DateTable[Region])
Do this... <Return entire table>
Else...      <Return Summazied table> [Without the Region Field]

But IF will only return a Scaler value, and not a table.

Other posts have said you cannot return a table, but you can create a virtual table to then calc a measure value, but I 've not been able to make it work yet! 😫

Desired Output:

Where Region slicer is being used:          

Where Region slicer is NOT being used: 

Measure values will change dependant on if they are calculated on the entire table OR the summarized table.

Any help would really be appreciated. 
Thx 😁