RX 400h switch to metric display

Moin Moin first of all, I’m new here and recently proud owner of a 07 RX 400h from Amiland. At the price I just had to hit. But there are a few problems with the Ami too. Since I have a lot to do with import cars, I know that with many manufacturers and models the conversion from US to metric units (°C instead of °F, l/100km instead of mpg etc.) is quite easy. Only with my RX I can find no solution. Is there a trick or a way to change that via the service access? If there is also someone who has tips for activating the Navi on European DVD, always with it. I’m also wondering if the graphical insertion of the parking aid into the rear camera is only a software question, or if you have to replace whole ECUs? I’ve been looking for a lot here in Motor-Talk but not quite what found. So thank you already in advance for ev deluge tips and greetings from Fishtown Ralf