This field contains the ID of the POS menu that controls the look of the leftmost column in the timeline view of the Allocation panel, the one that shows the dining tables within each page.
The number of rows (that is, number of dining tables shown) is defined by No. of Dining Tables Shown for the dining area.
Here you select what text information is displayed as description and/or glyph text by selecting POS tags starting with <#TR-AL-E-, such as the <#TR-AL-E-TblDescr%1> tag that displays the description of the dining table and <#TR-AL-E-Capacity%1> tag that displays the capacity of the dining table.