Customize FLEX home screen and applications

Is there a way to choose what apps are shown on the home screen?  There are tons I don't use at all, have no interest in, all up toward the front, while ones I do use are far down the line or aren't even on there at all. I  have to look them up every time, even if it's the only app I've used for days.  I checked all of the menus on the box, and under apps there are no actual choices to do anything intuitive regarding the apps shown. I have it set to show it in the order I use them, and not featured etc, but it doesn't change anything. 

Homescreen = the first and only screen that shows as soon as you turn on your tv. 

Another issue I have is actually being able to add services or upgrade ones you have.  All instructions always point to being able to just add the service from the app choices but you can't. and you can't upgrade apps without having to call in.  I tried to upgrade my paramount to paramount plus showtime, and it was impossible. I chatted with customer service like 3 times and everyone kept telling me it was done until finally one person said that it couldn't be done and I had to contact Paramount + but Paramount + says to contact Xfinity if you get the service through them. I ended up cancelling it.  And actually I saw it on my November bill even thought it was cancelled Nov 1. so I have to remember to contact someone about that.