To select the link in the Address Field on activation or not? The choice is yours.
Reorder Address Field drop-down menu's categories according to your preferences.
Enable "Show Full Address" to see the complete web page URL without needing to focus on the Address Field.
Give the Search Field the space it needs by resizing it.
Press Alt+Enter to open a link or a search entered in the Address Field in a new tab.
Add empty space to the Address Bar to resize the Address Field.
Customize browser toolbars from Vivaldi menu > View > Customize Toolbar.
Copy links from the Address Field without additional parameters.
Click on the padlock on the Address Bar to access Site Settings.
Ctrl / ⌘ + click on the URL to cut the link at the point you clicked on and go to that page.
Press Ctrl+L / ⌘L to focus on the Address Field.