I have designed a machine. There are many subassmeblies and parts. When I designed the parts, I did not focus on the planes. For example, I have a chair. The chair is upside down when it is in regular ISO view. I want to flip the plane and I want it would not affect the mates in the assembly. Any suggestion?
You can update standard views.
Here's the help page for updating your views. Updating Standard Views
I attached a video too. you can see this feature in action.
I changed front view and rear view in this video.
You can reset your views by clicking Reset views button.