We are happy to announce that after hearing your feedback we have implemented some improvements to the Stack container.
The new improvements include:
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Ability to use top and/or bottom margins for all items
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Equalizing margins for all items at once
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Alignment shortcuts
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Improved on stage dragging
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and many more…
All stacks will automatically get the updated features. You will find the alignment and margins control in the inspector.
Equalizing margins:
Top and bottom margins for all items 
We are eager to hear your feedback on the improvements and what you think we should do next with the Stack!