Welcome to the forum. I doubt that you will ever be able to rotate a Detail View. I would suggest deleting the Detail View and inserting a drawing view of the whole model at the same scale as the detail view. You can then rotate it as you want and crop it to show the section you want.
And I'm curious. Why would you want a Detail View rotated and not the parent view?
thanks for the work around.
i have a antenna base plate with a lot of Text to be machined at different orientations and i wanted to have a detailed view of each to help show size and location also just to make each view easier to read as some of the text is rather small when you print it out on A3.
see below example
Thanks again for the help.