After rearranging field order in a view, how do I export this modification in features?
I found out there was no component to add to the feature: the modification was already there even if the feature status didn't change. 
The field order is stored into the file: 'feature_name.views_default.inc'.  In order to update the file with the modification, the feature must be 'generated'. (Go to feature --> recreate--> advanced options --> generate feature)