Open context menus with long clicks on the toolbar buttons.
Everyone knows that right-clicking on elements in the browser and on web pages opens a menu with a myriad of useful options. But there’s a lesser-known option in Vivaldi that works well on Vivaldi’s toolbar buttons and in Vivaldi Mail.
To open toolbar button context menus, simply click on the button with the left mouse button and hold it down until the menu opens. Then select the option you need.