In settings>Themes: Subtle?

In settings> tabs> tab display "remove tab spacing", "Dim icon when hibernated" and maybe settings about tumbnails. Hibernation extensions: https://www.reddit.com/r/vivaldibrowser/comments/8sgya7/does_the_vivaldi_have_a_setting_to_auto_hibernate/

In settings>Panels "Show panel toggle"

In settings>adress bar: "show full adress"

google autosugestions from: https://forum.vivaldi.net/topic/21163/re-google-search-suggestion-doesn-t-work

Open Vivaldi settings → search → search engines

Select google

Hit edit pen

In field suggest url add the following

https://www.google.com/complete/search?client=chrome&q=%s

Suggest settings

Confirm with OK

Also check privacy tab in stettings.

other links: https://forum.vivaldi.net/topic/18917/google-suggestions-address-field/3 and https://forum.vivaldi.net/topic/6989/google-search-suggestion-doesn-t-work/15

remove search field

In settings>Privacy uncheck "save passwords"

Make tab close button always vissible: https://www.reddit.com/r/vivaldibrowser/comments/6jyea7/is_it_possible_to_make_tab_close_button_always/