is it possible that there may be something floating in your view that is causing the crop region to be that large?
open the view, uncheck all boxes that relate to the crop region, zoom extends, does your view change?
turn on the crop region visible button adjust it manually
now turn on the Annotative crop region button and adjust that manually also
select the blue dot on the dashed line to adjust it separately from the model crop region
see image below
the dashed line is the Annotative crop region the solid line is the model crop region, they could be adjusted in your view to cause this

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