It is a common misconception that there is a simple "English" button hidden in the settings. For the AVIC-MRZ07, your options are limited to:
A translated version of the MRZ-series manual is hosted on GitHub. pioneer carrozzeria avic-mrz07 english manual pdf
Because this unit was intended for Japan, an official English manual from Pioneer Corporation does not exist. However, the enthusiast community has developed translated resources and unofficial English documentation: It is a common misconception that there is