Pass-through mode of only selected folders

everything is clear from the name.
is it possible to make the pass-through mode applied only to the folders I selected?

What is meant by "pass-through mode"?

FLATVIEW?
mode in which all files in the folder are displayed


pardon me. forgot about the peculiarities of the language

There isn't currently a way to make Flat View only expand some sub-folders and not others.

Tools > Find Files can be used to get a listing of everything that is (or isn't) below specific folders.