What is the Menu Customization on install of 2017?

Upon launching SW2017 the very first time I am presented with an option...

Once answered, you will never see that box again. I had to install on a different computer just to get a screen shot.

The message has so little info to help me make an intelligent choice. I perused the What's New PDF and didn't find a mention of this change to Menu Customization.

What are the consequences of selecting Yes?

What are the consequences of selecting No?

If I select Yes, how/where can I change my selection?

If I select No, how/where can I change my selection?

Dassault programmers, can you please add some intelligent text to message boxes or at least add the Help button with a link to a descriptive page?

SolidworksGeneral