It is possible to specify on it using the advanced search function
To reproduce:
start a basic search
select Java edition as project
click on the more button to select new criteria
start to search on "confirmation status"
see that it is not available to use
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Comments 3
Queries that use custom fields will often need to be defined in the advanced search (JQL) function such as:
project = MC AND resolution = Unresolved AND "Confirmation Status" in (Unconfirmed)project = MC AND resolution = Unresolved AND "Confirmation Status" in (Unconfirmed)Or you can use the workaround as mentioned by @unknown above.
You'll need to select "Bug" under the Type dropdown menu for this to be applied here.