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E.g. 2U means 2 Panels, arranged horizontally, 3E means 3 Panels arranged vertically.
Because a Panel can contain a Frame (which is a Screen and has a Layout)
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E.g. 2U means 2 Panels, arranged horizontally, 3E means 3 Panels arranged vertically.
Because a Panel can contain a Frame (which is a Screen and has a Layout)