@krzysztofdrozdowski @MattEclipsed I see this is mentioned in blogpost:

"While you’ll find Vivaldi Social in the Panel of the browser, you can also add any Mastodon instance of your choice as a Web Panel to this sidebar. By doing so, the website or any Mastodon instance is displayed within the side panel of your browser, creating a split-screen view."

would be helpful to have written somewhere after clicking mastodon icon and before I login to @vivaldi.net ... 🤷‍♂️