How to stop exporting libraries to the wrong file folder which I accidentally choose?

When I first use the function of "exporting libraries" in the "file" menu, I choose the wrong file folder and clicked the choice of "keeping update". After that, I found the zotero is always keeping output a ".json" file in the file folder which I don't want it to. So can anybody teach me how to stop this "export" function, without reinstalling zotero or deleting my library?
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