When you create a "Fixed-size list" control, it is impossible to change the size of the header and the text, but it is possible in "Drop-down" mode. Why?
It's possible to get around this problem by creating a table chart to have the same effect as a fixed-size control, but in the case where my field control is a parameter, it doesn't have the desired effect. Do you have a solution for enlarging the text size?
Good question! This isn't possible right now. There appears to be an open feature request with several upvotes: https://issuetracker.google.com/issues/131229719
I recommend adding your upvote and use case there!