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Thank you a lot for sharing your ideas and suggestions! I appreciate that

1. No The switching option won't redirect visitor to page with old numbers in URL. The parameter will be stored in session/cookies and the start page of the directory will be opened. So, user won't be able to get a wrong page from the website navigation.

4. Sorry, then I didn't quite understand the essence of your idea:( We already use prev/next in pagination for 50 or 200 items on page.