Multisite-wide search from main website does not include results from subsites
we have a WordPress Multisite installation with Header Builder enabled and we are facing the following problems:
1) When searching from the main website, the results displayed do not include those that are related to subsites, i.e. it seems that the search is performed on the main website only and is not performed on the subsites also.
2) Apart from the above, when performing a search in the secondary language (Greek), the language is switched to the primary language (English) and the result is displayed (performed incorrectly), therefore, you need to change the language from EN to EL in order to be able to see the correct results.
a) Searching for the word Πανεπιστήμιο in Greek language
b) When pressed the Return key, the language is automatically switched to English and the wrong result is displayed:
c) Switching from EN to EL language, 28 results are displayed belonging only to the main website and do not include results from the subsites, as mentioned earlier:
Could you please look in these matters?