Hello, is it possible to add an the item: "View with Internal Viewer" to the Right-Click > View Menu?
This makes it easier when wanting to view a specific book in the internal viewer instead of the system-configured default viewer (for desired cases, e.g. formatting is broken in the system's viewer, but is working nicely in Calibre's internal viewer).
The current "workaround" is to go to preferences > behaviour, enable that format for internal viewer, open the ebook, then revert the setting in preferences > behaviour

Or to launch the E-book Viewer externally, and then load the book (recent list, or manually browse) (also a cumbersome option...)
Thank you Kovid Goyal