Query Scope
Specifies the scope for the query. For example, you can specify that the query scope includes all the parts in the assembly, only parts that are currently displayed, and so forth.
Search Subassemblies
Specifies that you also want to search subassemblies within the active assembly.
Load Subassemblies
Specifies that you want to load and search any hidden subassemblies that were unloaded from memory using the Unload Hidden Parts command.