Hi there!
Open your barplot.qzv, select the desired taxonomy rank level and download the CSV
from here: SILVA 138 Classifiers
and i recommend this file (but its up to you!)
SILVA-138-SSURef-noSpeciesLabels-full-length-classifier.qza
Ask @SoilRotifer for the differences between version 1 and 2.
its possible to denois them separately, but its recommended to denois them together