You have fallen into the trap of thinking the
All Relatives Diagram shows all relatives.
It does not matter where you select your wife's
Individual record (Focus Window, Records Window, Named List, Diagram), the diagram will always be the same.
If you digest this thread and
Splitting my Wife's tree away from my own (14537) and other related threads and
Wish List Ref 501 Entire Pool Diagram you will realise there is a difference between
All Relatives Diagram and
Relationship Pool.
That is why the
Plugin is essential.
If the
All Relatives Diagram displayed
every relative however distant, then it would be quite easy to select the branches you want and omit the ones you don't. Then saving that selection as a
Named List gives you the records needed to export just those desired branches. But the
All Relatives Diagram does
not include everyone in the
Relationship Pool so that method won't work reliably.
Your very first posting said you wanted to "
isolate all the ancestors/relatives on my wife's side of the tree and create a new FH project file for just her family". Well now the
Plugin has given you the
Named List of required
Individuals you can create that
Project using the advice in how_to:exporting_gedcom_with_multimedia|> Exporting a Family Tree Branch with/without Media.
Even after creating that
Project, the
All Relatives Diagram will not necessarily show all your wife's relatives, but it won't show yours.