Brother P-TOUCH 3.1 - Manual (Page 168)

The "Display Database Field Names" setting makes it easy to distinguish
which objects in your layout are fields that have been merged from a
database. For example, when the field names are displayed, a field called
"Last Name" would appear as shown below.
When the record data is displayed instead of the field names, a field
containing the first name "Jones" would appear as shown below.
Measurement Units:
Select the unit of measurement for the rulers and other settings.
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