In the Family Historian Manual, Queries are defined as "stored sets of instructions which allow you to specify criteria for identifying a set of records of a given record type." see Queries for a general introduction.
Family Historian V3 is supplied with 36 Standard Queries. Earlier versions may have less.
These can only be run from the Query Window and cannot be edited.
If you wish to amend them in any way, the procedure is to copy them into a Custom Queries and make amendments there.