The Bitwarden extension has always worked on the Opera menu bar, and up until the release of Opera version 78 it also worked on the sidebar. The sidebar greatly improves the use of Bitwarden, It resizes the main window and allows the Bitwarden window to be instantly pinned beside it. The sidebar is the main reason that I use Opera. According to the people on the Opera forums, in order to have an extension work on the sidebar, the extension has to be written specifically for the sidebar. All of the sidebar-only extensions in the Opera extension store, such as Side Calculator, work correctly with the latest Opera releases. I think that if the Opera team is not going change this, the Bitwarden team needs to develop a sidebar-only extension for Opera.