When working with all the different windows (i.e. Material Manager, Attribute Manager, Object Manager, etc.), it can become difficult to keep track and organize them all. Grouping the windows allows you to organize to your personal workflow needs. With the new Group Window feature you're now able to organize multiple managers within a single tab, giving you even more options for customizing the layout to your needs.
Step 1: Create a New Group Window (Window=>Layout=>New Group Window).
Step 2: Position it just above the View Panel. Click the double bar line and drag it above the View Panel. A dark grey line should appear just above the View Panel. Release it and you'll see a large gray space between the double bar line and the View Panel.
Step 3: Right click (or Cmnd click) on the double bars and select Make Tab, and then right click again and Rename it to 'View' so it'll be easier to select the View Panel later. Now drag the View Panel by the thumbtack icon and drop it into the Group Window space.
Step 4: Create another New Group Window.
Step 5: Drag all the windows that you want to get out of the way into the New Group Window by dragging them from the thumbtack icon. You can convert the different managers to tabs to give more view room. You can create tabbed managers by dragging one thumbtack onto another thumbtack.
Step 6: Drag the group window by the double bar onto the View tab. There should now be two tabs.
Step 7: If you like your rearrangement you can save it as your default layout. (Window=>Layout=>Save as Default Layout) Or if you want to save it but not use it every time you open CINEMA 4D, then you can just save the layout (Window=>Layout=>Save Layout as...) and load it whenever you need it (Window=>Layout=>Load Layout...).
Step 8: If you don't like the rearrangement how you set it and want to go back to the default, you can go to Reset Layout (Window=>Layout=>Reset Layout).
Now that you've cleaned up the windows a bit, you should now have a little more space to work with and a little more viewing room.
