Your File was replaced by new Technology file. To Layout Design Layers can be selected from a Layer Palette on upper left side of L-edit screen. You can see chosed Layer above the Layer Palette. Layer Palette is not one page, you can see another page to click arrow under the Layer Palette. Select drawing tools from the Tool Palette under the Layer Palette.
Arrow is for pointing and selecting objects.
Rectangle , Polygon , Wire and Circle are used to draw objects. Port is used to define signal entry points, or to apply text labels. Mouse's functions are showing lower left side of L-edit screen. If you are pushing Alt Key, Mouse's functions is changed to another function. Use Edit and View Commands to make your work easier.