Hi, With the latest update of Acrobat DC on 13th Feb, this issue has been addressed. Make sure you are on the latest update by visiting Help > Check for updates (18.011.2003x Planned update, February 13, 2018 — Release Notes for Acrobat DC Products ). We have added a preference "Use Shift + Click for Multiple Selection with Output Preview " to enable multiple objects selection when the output preview dialog is open. To select multiple objects, use Shift + Click. To add a sticky note containing the color values, use Alt + Click (on Windows) or Option + Click (on Mac). For details, refer Previewing output (Adobe Acrobat Pro). Please try it out and let us know your feedback. Regards, Priyanka Jain
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