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An E-shaped table comprises a top section and between 2 and 25 sprig sections.
Add an E-shape table using Insert>E-shaped Table... .
Uncheck all sections left-right symmetrical if you want to set different numbers of seats down 2 sides of a section.
Check by section if you want to number the seats in each section separately.
If auto is checked the table size will be automatically adjusted to the number and size of seats.