I didn't have TurboCAD open when composing my last Post. Let me try to clean it up here.
>Un-check "Fixed" first;
>"View Name" should no longer be "grayed out";
>Click "OK" to close out of Viewport Properties;
>Re-open Viewport Properties, and click "Fixed" and enter the desired fixed value.
Again, TurboCAD has behaved this way for me in all versions I have used, including trialing 21. -Alvin