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you can't do sub-columns within sub-columns).
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Undo/redo any Builder modifications before saving or closing the Builder.Drag and drop the module to the column/grid to add modules.Click on the Purple "+" icon found on the top left corner, or at the last row to open the module container.Below the content editor (make sure the post is saved/published), you will find the "Themify Custom Panel > Themify Builder" tab like the screenshot below.
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