To display drawing (drafting) tooltips when mouse-hovering over fabrication parts (CADmep items) within a drawing, do the following.
Do NOT start AutoCAD by double left-clicking on a drawing. Drawing tooltips will not display on CADmep items using this method of starting the application
The drawing tooltips should now display on CADmep items.
For more information, see About Tooltips in the AutoCAD Help.