Is it possible to Query Label, using the labels in the Patch Database?
no, but you can query all the patch keywords. you can set them in patch > database. and then query them in query > keywords
Is there a reason it is not possible to Query Label? It sees like such a glaring omission.
Somehow, when there is a so-called 'Verified' answer nobody looks at it anymore, but this is still an active question.
I've made a feature request here: https://community.etcconnect.com/control_consoles/eos-family-consoles/i/feature-requests/query-labels-from-patch
Are you looking for a single channel or select multiple channels at once? If a single channel, you can do shift+about to search for a channel, but you cannot multi-select channels this way.
It should work for multiple channels as well. I could use the Label BACKWASH LUSTR for 7 channels and want to be able to find all of them.
