It's hard to give a specific answer without knowing what relation you need between the values in the alternate states and the range (happy to elaborate if you can provide more detail).
But the key thing is that you can get to the alternate states using set analysis.
Say that I have two bar charts in an insurance app that both have one dimension 'Claim Type' and one measure 'Average Claim Amount'. The first uses 'State 1' and the second uses 'State 2'.
I want the y-axis range to be bound by the largest bar displaying in either of these two charts.
I could use the following as my y-axis max:
=RangeMax(
Max({'State 1'} Aggr(Avg({'State 1'} [Total Claim Cost]), [Claim Type])),
Max({'State 2'} Aggr(Avg({'State 2'} [Total Claim Cost]), [Claim Type]))
)
The first argument in RangeMax is using an Aggr() function to dynamically create a table of average claim amount per type under the State 1 selection, and taking the max of these (ie. the value of the tallest bar in State 1).
The second argument does the same thing to find the value of the tallest bar in State 2.
Finally, the RangeMax returns the higher of these.
Note that you can use set operators to combine the selections in these states together. Say if I wanted to display some text above the bar charts that displays the value of the largest single claim under the selections in either state. I could use the '+' operator to run my calculation across the union of the states:
=Max({'State 1'+'State 2'} [Total Claim Cost])
The '+' in this context is called a Set Operator, there are other ones available allowing you to combine alternate states in various ways. See here for some more detail and examples: https://help.qlik.com/en-US/qlikview/April2020/Subsystems/Client/Content/QV_QlikView/ChartFunctions/SetAnalysis/set-analysis-expressions.htm
