Open the file in AutoDesk TrueView and use the Continue opening DWG file option:
By default the drawing model will open in 2D Wireframe mode so the view looks incomplete for some objects.
Change this setting to Realistic provides a complete view of the model:
Drawing sheets will require similar changes for viewports (views from the sheet into the model). Double-click on the viewport to access its default mode of Hidden:
Change this to Realistic mode, then double-click outside the viewport to exit the edit mode: