How to change the setting in a multiselect dropdown box so that the two options must be available and not one of the two?
You mean so the user has to select two options all times, but cannot select only one? Or the user has to select both of the options, if selects one of them?
Unfortunately this is only possible by making some kind of custom script to handle these requirements, there are no options for conditional selections.
In a dropdown box without a multiselect and an “any possibility” you notice what?
For an “any” value, use an empty value as described in the documentation: https://goo.gl/vVwCqH
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