[GNC] Multiple-Select during QFX import

[Mike stagl]

I am trying to get started with the QFX import feature of GnuCash.

According to 6.15.5.2 of:

https://www.gnucash.org/docs/v3/C/gnucash-help/trans-import.html#trans-
import-matcher

I should be able to select multiple items in the import matcher.  I
cannot seem to do so.  Is this a feature of a later version of GnuCash?
I have tried all combinations I can think of with mouse buttons with
and withou CTRL and SHIFT keys.

I am running 3.4 on Debian Linux.

The screen I am attempting this on is titled "Generic import
transaction matcher."

Thank to all the contributors!

Mike