Use Ctrl + P, its a GoTo Anything Popup:-
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Type, to search through files (open files, recently closed files, and files in open folders)
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@foo, to search through symbols in the current file -
:foo, to go to the given line number -
#foo, to do a fuzzy search in the current file for foo
These can be combined: foo@bar will search for the file that best matches foo, and go to the symbol in that file that best matches "bar". foo:100 would go to line 100 of the same file. You can use this to preview a location in another file, then hit escape to go back to where you where.