From @RK ​​​​​​​

A little gem of an accelerator that is a bit hidden away is the capability to add keyboard shortcuts for 3DEXPERIENCE apps. It makes switching between them incredibly quick and easy. 

This is possible through the Customize option and here is a quick demo on how this can be setup and its usage.

The video does not do justice to just how easy and smooth this is. So dont hesitate to give it a try yourself. :)