The Edit tab provides access to the set of parameters for the current test script (equivalent of a single .TST file). The parameters are grouped in five subsections: Record, Settings, Requests, Sequences and Source.
The left pane of the Edit tab provides access to all scripts in the current project. You can select an active script, add a new script (right-click on empty space and select New) or remove a script (right-click a script and select Remove).