how to display multiple selection values in table

Hi oakfootballclub 

The ALLSELECTED() function returns a table and the measure can only return a value, that's why the visual can not display.

Maybe you can try to use the CONCATENATEX() function to get the outcome, here I create a set of sample data:

Then I create a measure:

MEASURE =
VAR _selectedValues =
    ALLSELECTED ( 'Table'[Values] )
RETURN
    CONCATENATEX ( _selectedValues, [Values], " " )

The result is as follow:

Best Regards

Zhengdong Xu
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