To access the 3D view in Revit, follow these simple steps. First, open your Revit project and navigate to the desired sheet or view where you want to switch to 3D. Next, locate the 'View Control Bar' at the bottom of the screen. Here, you will find a drop-down menu labeled '3D View'. Click on this drop-down menu and select 'Default 3D View' to switch to the default 3D view of your project. If you have multiple 3D views created, you can select any other custom 3D view that you have created from this drop-down menu as well. Another way to access the 3D view is by using the 'Project Browser' located on the left side of the screen. Expand the '3D Views' category and double-click on the desired 3D view to open it. Additionally, you can use the keyboard shortcut 'VG' to activate the Visibility/Graphics Overrides dialog and make modifications specific to the 3D view. Utilize these techniques to easily navigate to the 3D view in Revit for a comprehensive understanding of your architecture and design projects.