The lack of search suggestions in bar of adress and searching
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As above - properly options have been set in settings.
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If I understood correctly what you tried to write, seems the same FAQ as in https://forum.vivaldi.net/topic/21925/not-working-search-auto-complement
Some search engines don't have the suggest url filled. Vivaldi has only Bing and duckduckgo engines setup by default with suggest urls, not for Google.
read
https://help.vivaldi.com/article/search/
https://forum.vivaldi.net/topic/16624/autocomplete-addresses -