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Additional details: Potential root cause identified I've been investigating this issue and found a specific cause for the margin behaviour in the Editor.The .inlineFrame class on one of the container elements uses display: flex. This prevents CSS margin collapsing from working in Design mode.When I removed display: flex from .inlineFrame, margins started collapsing again in the Editor — matching what you see in Preview/Test and in email clients like Outlook and Gmail. Steps to reproduce:Add two stacked sections or text blocks with top/bottom margins in the Email Editor.In Design mode, notice the extra spacing between them (margins are not collapsing).Inspect the container and find the .inlineFrame class with display: flex.Remove display: flex from that class.Margins now collapse correctly in the Editor, matching Preview/Test output.This suggests the issue is not just a visual limitation of the editor — it may be a specific CSS property that can be adjusted without affecting drag-and-drop functionality.