Where is the install games and app section now

Hmm interesting, I now found that if you go to the Installed games section, highlight the first installed game on your list, hold down LB, then quickly press RB and X whilst keeping LB held that then your shows the ready to install section where your list
of ready to install/hidden games will show.

What is also interesting is that once you leave that screen and go back to My games & apps the ready to install section will be empty again, so you have to do the whole process again.

Edit....Tried this a few times now and it works pretty well.

Also works for the apps section.

Go to the "My games and apps" section on your Xbox One, then scroll all the way over to the right hand side where it lists previously installed games, in that list you will find all your 360 games that you can now download and re-install.

Have a look in your 'my games and apps' section where it says 'ready to install' hopefully it is located there.

You can install the Xbox Game Pass mobile app, and it will send notifications when games are leaving Game Pass and when new games arrive. If you can't install the app, you can follow Xbox Game Pass on Twitter. There is also a Game Pass section on the Home
Dashboard of the Xbox console now where you can find this information.

pretty sure you can go to the "my apps and games" section and click on the game from there and view the achievements for JUST that game. (the same place where you would install the game/app)