As seen in other 2D models, they have the a place in the main screen (on top of a gauge or in the right boundaries) where you click and the new panel appears.  Clicking again the new panel in an specific place will close it. For the engine panel to show up, that clicking section could be low right section of panel.

Example. For the engineer panel, will show the upper panel. Click at the bottom and shows lower panel, click at top and again upper panel.