If you're working in Blender and find yourself overwhelmed with multiple 3D views, here's how to close them to streamline your workspace. First, identify the 3D view you want to close. Look for the small square icon in the top-right corner of the 3D view. Click on the icon, and a dropdown menu will appear. Select 'Join Area' from the dropdown menu, and then click on the X icon on the side of the 3D view you wish to close. This will merge the two areas and close the 3D view. Alternatively, you can use the shortcut Alt + F4 to close the active 3D view. By following these simple steps, you can efficiently manage your Blender workspace and focus on your 3D project with ease.