John Gill Commentary 1 Kings 10:3

"And Solomon told her all her questions: there was not anything hid from the king which he told her not." — 1 Kings 10:3 (ASV)

And Solomon told her all her questions
Answered them, told her the meaning of everything she inquired about, expounded her riddles, solved her objections, and gave her satisfaction in all things she proposed to him:

there was not anything hid from the king, which he told her not ;
there was not anything, though however abstruse and difficult, but what he understood, and gave her a clear and plain solution of.