Cant set show_if constraint

how do I set the show_if constraint on a column? There used to be a field you could enter it in - now all I see is the show yes/no switch.

The screen says:-
Is this column visible in the app? You can also provide a ‘Show_If’ expression to decide.
but it doesnt tell you how. There is no space to enter the show_if expression

There is an blue flask icon on the right side. Click that on and you are able to write a formula.

Thanks for that - I think there is a problem with my browser (chrome) as that button definitely didn’t appear - I have seen other buttons come and go eg. the delete button on the graph series dialog. All seems to be ok now havin reloaded chrome - thanks for the quick response.

You’re welcome