how to interchange Dimension and Measure in a line chart

[Architect]

HI,-

I have below details-

1>Dimension (X axis), 

expression= ('20-10-2020'-Date2),

Range = 0 to 300.

2> Measure (Y axis)

expression=  count(prime_key)

Range= 0 to 20.

Need change the line chart, where X axis and Y axis interchanges.

[Or]

This doesn't seem to make much sense - if your change your dimension axis to count(prime_key), what are you counting prime_key for? You would always have only a single dimension value, which would be the count of all prime_key values.