in an Inventor idw/dwg file, you should find the "crop" view by "expanding all children" of the structure of views in the browser bar of the drawing.
To remove a "crop" section out of a view:
You should find the "crop" view in the view structure >> Click on it in the structure >> Right mouse click >> Delete => the crop view is removed and the original full view is displayed. >> recreate your new "crop" view.
To change the "crop" view limits of an existing view
>> slect the "sketch" under the "crop" view in the browser bar >> Right mouse click >> Edit (or directly doubleclick on Sketch) >> move the lines to modifiy the "crop" section view >> finish sketch.
I hope that will help you.
Please, mark any response clicking on "Accept as Solution" button if it answers your question