Duplicate pages on Joomla, causes, solutions?

Question

Joomla

Good afternoon. Before that, I worked a little with Joomla. And then the other day I ran into this problem. On our site, all pages have duplicates with the letter "m-" in the middle of the URL. For example
treet.com/treet
treet.com/m-treet
It's not entirely clear why. The site has JoomShopping installed.
How can I remove duplicates? Only redirects? Or is it still possible to find and eliminate the cause?

Answer 1

You need to use rel=canonical on the main page you want search engines to see.

Answer 2

Thanks, but the issue has already been resolved. It's just that the site was caught after another webmaster and duplicated the pages for the mobile menu. Just removed this menu