Resolved! Just update your Opera.
55.0.2994.59 – 2018-09-12 blog post
DNA-70512 Option to select search engine in Ukraine
DNA-70832 Random build failures due to missing dependencies v8 bindings test target.
DNA-71761 [Engine] No focus on address field when opening new tab
DNA-72359 Search box is missing on startpage
Be aware - This release will be available today for some countries; tomorrow, it will be ready worldwide.