As Ombir has mention, I've also the same assumption. Try to show the hidden fields and check.
Show hidden fields works for all the panes (dimensions, measures, sets and parameter) but there is a bug in case of parameters, hide option will still be available if its being used in your worksheet. See the screenshot.
Observing that, I've created an idea, you may vote it so that it can be fixed https://community.tableau.com/ideas/9475
Let us know if this help.