Kodi had a thing called “codecinfo” and that was remove as part of a code cleanup some time back for [reasons]. When there was an excess of requests to return this information to the new cleaned up code it was added back in partial form split into two different views; “playerdebug” and “playerprocessinfo”. The latter of which is what the older OSMC remotes would bring up with the menu key during full screen video playback. It sounds like what you actually expected/wanted, and what does not currently exist, is more of a extended media/codec info screen. There have been requests for such a thing on Kodi’s forum but afaik nobody yet is willing to write the code to add this feature.