It is impossible to open playlist using "usual" ways expected to user: - from (main) menu - by button on panel(s). It is only possible to open it by keyboard shortcut or, at maximum, by binding it to one of available mouse events (which list is very poor, by the way)
You can open the playlist by moving the mouse over the right or left (depending on setting) side of the video item. And close it by moving the mouse over the rest of the video item. If there was an item in the menu to open the playlist, then most likely, after using it, you'll move the mouse over the video and close the playlist. Same thing with the toolbars. If toggling the playlist with the mouse is disable a button in added to the footer.