Use the Keyboard Shortcut F4 to toggle the visibility of the Panels sidebar on and off.
Vivaldi’s Panels are one of the most useful features in Vivaldi. But if you’re a fan of a minimalistic user interface, you might find yourself having to choose between a super clean look and easy access to the Panels.
With Keyboard Shortcuts, you can have the best of both worlds. By pressing F4 on your keyboard, you can display the Panels sidebar and when you’re done, use the same shortcut to hide it again. You don’t even need to close the Panel you were last looking at.
But as it’s Vivaldi, there are a few other options you can choose from to toggle the sidebar on and off.