To place your model into a 3D view, select ‘View 3D’ from the Linear Draft toolbar. This will put your model into an isometric view.
Your model will be displayed in 3D so that all elements are displayed in your window. Follow the prompts in the bottom left of the screen to select a structure. This should be the structure that you wish to focus on.
Once a structure has been selected, the model will be orientated so that that structure you have chosen is displayed in the default 3D view.