There are far too many search options available to be able to fit them all into an easy-to-use menu. Many observation qualities are only searchable by manually altering the URL. Here is a link to the forum post explaining how to do that. For observation fields there is one other option: go to an observation that has the field entered and click on the name of the field. That brings up a menu where you can search for “Observations with this field and value”, “Observations with this field”, or “Observations without this field”.
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