Hi Konstantin Miller ,
The size you are talking about is dependent on the value of your measure ,if you want to change it manually and that too as per your wish ,in that case you have to create a calculated field and put the values as per your requirement .
And then put that calculated field to size under "Marks" .
the thing is, I want to have different marker sizes for different measures. Not for different values of the same measure.
In this case, I don't see how I can apply your workaround.
Also, I wonder if there is only a workaround for that and no way to actually directly individually adjust the sizes of the individual markers?