I myself found the Address Bar in the Settings!
For some mysterious reason, the left and right arrows, and the circular arrow for reloading a web page have disappeared from my Vivaldi tool bars.
I found no clue in the Settings for Vivaldi how to restore the above three images. Please provide the instruction!
(Other browsers like Chrome, Firefox and Edge provide a tool bar for including the above three images next to a Search window. Vivaldi does not seem to supply that tool bar. For obtaining a Search window, one has to open a new window in the tabs bar of Vivaldi. That seems unique to Vivaldi. I wonder why they might have designed the tool bars that way.)