You can Orient to View by Right clicking on the view cube in a 3D view and that will size it automatically to a specific view such as a level, etc.
You can got into a plan view and right click on the 3D view in the Project browser and Show Section Box. You can then adjust the grips to the correct size. The same works in sections to control the height.
You could create a scope box and assign the 3D view to that scope box. It will automatically size itself to the extents of the scope box.
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