When you choose Help > InDesign Help, the Community Help and Support Page opens. Some people have told Adobe that they’d prefer opening the main Help on the Web page. Now, you can select an option to start on that page.
Here’s how to change the default:
1. Open the main Help on the Web page.
2. Select the “Help on the Web” option.

Keep in mind that no matter which option you go with, you can always click a link to jump to the other page. In my mind, it makes sense to route Help > InDesign Help to Help on the Web. If I want to go to the Community Help and Support page, I can choose Help > Online Support.
Let me know if you have any questions or concerns. I’ll pass them along.

+1 for changing the way users navigate through help pages.
Here’s how to change the default:
1. Open the main Help on the Web page.
Unfortunate, i have the same issue as you, I can’t change the default in order to open the main Help on the Web Page.
How to disable all the help, it’s something that i don’t use and I like to don’t have it anymore!