Documenting the System - Mastering phpMyAdmin 3.4 for Effective MySQL Management - page 262

The next section is the table placement portion. We can now see the benefit of the
Automatic layout feature—we already have our three tables selected, with the X and
Y coordinate columns filled in. We can add a table (on the last line), delete a table
(using the checkbox), and change the coordinates (which represent the position of
the upper-left corner of each table on the schema):
To help set exact coordinates, a visual editor is available for JavaScript-enabled
browsers. The editor appears when the Toggle scratchboard button is clicked once.
It will disappear when this button is clicked again. We can drag and drop tables
on the scratchboard, and the coordinates will change accordingly. The appearance
of the tables on the scratchboard provides a rough guide to the final PDF output.
Some people prefer to see only the table names (without every column name) on the
scratchboard. This can be done by deselecting the Column names checkbox and then
clicking on Save . The following image shows an example of this scratchboard: