Please send me the specific code, I don’t know how to answer your question
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My previous problem has been solved because it referenced the old version of jq ui file.
This is the source code, but the secondary menu is horizontal, which is not what the teacher said. This is my new problem.
Horizontal menu--Navigation bar
Aberdeen
Ada
Adamsville
Addyston
Delphi
Ada
Saarland
Salzburg an der schönen Donau
Saarland
Salzburg
Delphi
Delphi
Perch
Amesville
My previous problem has been solved because it referenced the old version of jq ui file.