How to show the Opacity selector in the color palette?

Hi guys,
does anyone could tell me how I have to do to display the opacity selector in the color palette?
In my palette there is no selector to adjust the opacity of the colors:

Thanks in advance.


This is controlled by the developer. In the case of stacks, with the current version, the developer of each stack has to enable the Opacity function or it will not appear. So the best thing to do would be to request that change with the stack developer.


Thank you for your answer.

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