Search for parameter set to All

Is it possible to search for a parameter set to All? Or conversely, a parameter set to anything but All?
I created a dropdown control associated with a parameter. I’d like to use the parameter to show/hide another visual either: 1) when All is selected or 2) anything but All is selected.

I tried many combinations of All, ALL, Select All using quotes, no quotes, and brackets.
I also tried wildcard search to detect anything but All being selected.

Screen Shot 2021-10-29 at 5.15.25 PM

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At the moment, when “Select All” is selected in a parameter control, that parameter is set to null value. However, there is no way to specify null in a rule for a visual.
We are working on allowing authors to customize what value is used for “Select All”. In Q1 2022, authors will be able to specify custom “Select All” value and then use that value in the rule.