You can hide apps on HTC One, so they are no longer visible in app list. To manages apps on Android HTC One, and hide or unhide them (show hidden apps) do as follows:
1. Go to App List (App drawer)
2. Tap three dot button at the top right
3. Choose "hide Apps"
4. Now you just need to mark the apps to be hidden
5. Tap "Done" when you are done. Number of hidden apps is shown right to the "Done" button
** To show hidden apps, you just need to unmark them