Hi!
If you mean that it does not show any results when you switch to the localized language of the site and then do a search, then I can only think of one possible cause: On the Compatibility Options submenu the Use the custom ajax handler? option is turned off: https://i.imgur.com/KGUK9mU.png
If you however mean returning results on the main site from the localized site as well, then you will have to turn off the WPML compatibility option on the Advanced options -> Content panel on the search settings page: https://i.imgur.com/psTtRX5.png
Let me know if this helps.
Best,Ernest Marcinko
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