You can pin games and apps but can't pin episodes/series anymore?

I don't see why use pins when in a simple sentence,you can launch a game or an app.....

I don't use pin anymore,i just pin 6 apps to have a more colorful dashboard.

Pins allow you to quickly find the apps and experiences that you use the most. Think of a pin as a bookmark. You can pin your favorite game, app, or webpage to your Home screen for quick access.

For more details, please see the link below:

support.xbox.com/.../pin-content-to-home

Are you referring to the apps on the Home tab or the Pins tab? To pin Internet Explorer, go to your My Games & Apps section, click the Menu button (the old Start button) and click Pin to Home. Any pinned apps will show on the Pins tab. To unpin an app, go
to the Pins tab, highlight that item, click the Menu button and select Unpin. The apps on the Home tab is more less recent history. On the Pins tab, the only re-arranging you can do (without un-pinning and re-pinning )is using the Move to Front option, which
will put the Front app in the upper right-hand corner. Probably the easiest way to do this is to create a list of the pinned apps you want (most important at the top, least important at the bottom), then using that list and going from bottom to top click each
app and select move to front. Once you are done the last one you Move to Front will be the top on on your list. Hope this helps!

I can't go full screen.

When I go to my games and apps and press start on Game DVR I can only select pin to home or help.

When I go to my dashboard and go to the pin and press start it only shows remove pin or move pin.

Tried to open dvr straight after xbox started up and it opens settings and game dvr as a snap

I don't agree with #2 becuse you can pin games and your most used apps right to the pins. I almost never use the my games and apps portion. And it's easy to unpin apps also. Hit the right bumper from home and wa la right to your pins.