I recall, for previous versions of OSMC, pressing the three line button during playback would prompt some useful information on screen, like codec, core usage, etc.
Now, it just brings up the Kodi video stream window.
Is there any way to bring back to the old information dashboard with the three line button?
PlayerProcessInfo moved to long-press ‘info’ button if you have the custom keymap enabled. You can find notable mapping [here]
If one decides to disable the custom keymap the mapping will revert mostly to the old behavior, including the menu button bringing up PlayerProcessInfo during full screen video playback.