Options / Catalog / "Import folder" vs. "Add folder"

[nji9]

... what's the difference between the two?

Moreover:
Is there a way to add a directory including all its subdirs
with one command?

[xnview]

"Add folder" in Settings>Catalog??

[nji9]

Sorry, the correct location is Tools / Settings / Catalog for both.

In Catalog directly: "Import Folder",
in Catalog / Excluded/Included: "Add folder".

What's the difference between them?

And second question:
Is it possible (by one of them) to include a folder with all its subdirs
without having to visit all directories?

[xnview]

In Catalog directly: "Import Folder",

import all files info/metadatas in catalog, it imports files+subfolders

in Catalog / Excluded/Included: "Add folder".

Add a folder that must not be added in catalog

[nji9]

in Catalog / Excluded/Included: "Add folder".

Add a folder that must not be added in catalog

Thank you.

... but why is it called "Excluded/Included"?

[xnview]

you can include "d:\folder" and exclude "d:\folder\subfolder"

[nji9]

Weird... isn't it

BTW
A mean to prevent dumb questions (like mine ) might be to provide tooltips
(for every GUI element).
As there probably will never be a docu for XnViewMP...