Did you unintentionally move an email to the Trash folder or did you change your mind about marking a message read? In Vivaldi Mail, you’ll find a menu listing your latest actions, so you can undo the ones you need.
To undo an action:
“Undo the Latest Mail Actions” button on the Mail toolbar. 
To make your move from your old browser to Vivaldi smoother, you can import important data such as Bookmarks, Passwords, History, and, the latest addition, Extensions with just a few clicks.
To import Extensions:
Vivaldi menu > File > Import from Applications or Files.
You can find Keyboard Shortcuts for numerous actions in your Vivaldi browser and with Command Chains you can make many more. For example, you can create a chain for moving the active tab to a different Workspace and bind it to a Keyboard Shortcut and Mouse Gesture of your choice. You can also type the chain’s name in Quick Commands and even add a custom button on one of the toolbars to execute the chain on click.
To create a command chain for moving the active tab to a different workspace:
“Add Command Chain”. “Add Command” button in the top right corner of the first command to add the next one.
New Gesture and find the chain you created.In Tip #196, we showed you how to open a link or a search you entered in the Address Field in a new tab. But using a slightly different Keyboard Shortcut, you can also open it in a new browser window.
To open a new window from the Address Field:
Ctrl + Shift + Enter / ⌘ ⇧ Enter on your keyboard.If you’re using Vivaldi Calendar to manage your events and tasks you may have noticed that past events and completed tasks have their colors a bit faded. This lets you easily see what’s done and what’s still ahead.
Past event fading is enabled by default, but you can review and update the setting to match your preference in Settings > Calendar > Calendar Display.
It’s easy to end up with more open tabs than you can keep track of. That’s why, when you type a link in the Address Field, Vivaldi will point out that you already have the same URL open in another tab, allowing you to switch to that tab instead of opening a duplicate tab.
To switch to an open tab:
Vivaldi Mail’s Quick Reply is perfect for those fast, short replies, and feels like using an instant messenger. By removing the need to switch screens to open the composer window, this feature allows you to respond to emails more quickly.
To send a quick reply:
When you feel like the browser is getting a little sluggish, it’s likely that one or more of the tabs is using a lot of resources. In that case, it might be a good idea to close or at least hibernate the tab(s). To find the resource hogs, simply hover over a tab on the Tab Bar to view their memory usage.
If you don’t see Tab Thumbnails on hover, go to Settings > Tabs > Tab Display > Tab Options and make sure “Show Popup Thumbnails” has been enabled.
Web Panels are great for taking a quick glance at a website, but occasionally the mobile-sized view may not be enough. In that case, you can open the current page you have open in the Web Panel in a tab instead.
To open a Web Panel in a tab:
Some websites offer their content in multiple languages. In which language they display the pages in your browser depends on your language settings. Make sure to include all the languages you speak and list them in the order of preference.
To update your list of accepted languages:
Add Language button to select a language you speak.
If you have “Switch Tabs By Scrolling” enabled in Settings (see Tip #184), you can switch tabs by using the scroll wheel on your mouse. But did you know, that you can also switch Workspaces like that?
To switch Workspaces:
In Tip #39 we told you about Keyboard Shortcuts you can use in the Vivaldi Calendar to switch to specific views (Day, Week, Month, etc.). In this tip, we’re introducing you to alternative shortcuts, which allow you to cycle through the views using the same two shortcuts.
To cycle through calendar views, press:
Alt + Page ↑ – to zoom in, and Alt + Page ↓ – to zoom out.Step by step, you can zoom in from Agenda view down to Day view and from Day view out to Agenda view.
Found something interesting on a webpage that you want to save, but an image would convey the message better than text? With Vivaldi, you can take a screenshot of the web page and automatically create a new note with it.
To save a screen capture as a note:
“Capture page” button on the Status Bar.The captured screenshot will be attached to a new untitled note, which you can view and edit in the Notes Panel or Notes Manager.
Single Key Shortcuts are a great way to get things done quickly and efficiently, without needing both hands or complicated finger gymnastics on the keyboard to reach multiple keys simultaneously. For example, you can use Single Key Shortcuts to zoom in and out on web pages.
To enable Single Key Shortcuts, go to Settings > Keyboard > Keyboard Shortcuts.
To zoom in and out, press the following numbers either above the letters on the keyboard or on the number pad: