Field Parameters - Returned using IF or Switch

I'm trying to do the exact same thing. My code looks very much similar to this. Select 4 paramerts if "Yes" is selected in one of the slicers, or select 6 parameters. Using this paramet in the table cloumns. Table will show either 4 or 6 columns depending on what is selected in the slicers. It looks so simple, but IF and SWITCH do not work, it gives me the same erros. I wish it worked, would have been amazing to do such conditional displaying of columns and parameters. Tried many things, no luck.