VERIFIED SOLUTION i
Applies to Portrait Dialogue versions from 6.0.0 and higher
Since Portrait Dialogue 6.0 has been released it is possible to have only one "Browse" tab opened at the same time in Explorer bar.
One Browse tab is opened and it is used for Dialogs. Selectioons, Message Ttemplates, Questionnaires, and Report templates.
The Explorer browser will always have it's own tab.
The change was made to help limit the number of opened tabs and was discussed with users and services people before the release.
UPDATED: August 24, 2017