The single-row table simply means that every row of such a tabulation is a separate table.

In the following example, you look at 5 single-row tables that appear as one 8-columns table.

What is the advantage of the single-row tables?

You can easily produce a “chained” sequences as in the following screenshot – after a bold tabulation line with trailing dots in a 2 column structure (that appears as a four column structure due to the usage of Bell markers), follows the plain, differently formatted tabulation line with 3 columns. Then, the sequence repeats itself again as much as you want.

Such effect could not be achieved in the dialog-based genuine tables, as you cannot predefine a sequence 2-3-2-3-2 etc, but only 2-2-2-2-2 or 3-3-3-3-3.