Excuse me, how can I transfer from platform 2E to platform 2D at Charles de Gaulle Airport in Paris, France?

Take the airport free car ferry shuttle bus, which takes 6 minutes from 2E to 2D, 5: 30 to 1 1: 30, and 20 minutes at other times. The whole journey only takes more than ten minutes. So it won't take long to get from 2E to 2D. It's okay to walk.

With a German visa, even if you enter the country, there is no problem. Charles de Gaulle Airport is divided into international zone and Schengen zone. You can transfer to a non-Schengen country in the international zone. If you want to go to other Schengen countries, you need to enter the Schengen area.

Generally speaking, connecting flights do not need to enter France.

The rules of Charles de Gaulle Airport are:

If you go to another country in the Schengen area of the European Union, you don't have to go through police and immigration control procedures. You can go directly to your boarding gate. If you go to a country outside the Schengen area of the European Union, you must go through police and immigration control procedures before going to your boarding gate.