On the General Options -> Sources 2 panel, make sure there is nothing selected: https://i.imgur.com/vff30Uf.png
You may have selected some taxonomies there to be returned.
To edit the generic selectors, go to the Frontend Search Settings -> General panel: https://i.imgur.com/sPqALT1.png
..the date filters can be configured under the same panel, under the Date filters subpanel: https://i.imgur.com/HiMoqcw.png
I hope this helps!
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