I can answer those for you!
1) They're not in the game I'm afraid- we didn't include everything from the PC version and added some features of our own, so will notice some differences.
2) You can totally do that! On Xbox I believe it's X when you're hovering over the prisoner to access the Prisoner Options menu. To send them to solitary, navigate to Punishments. To change their sec level, navigate to Security.
3) You've got your items sorted by room type, so when you leave the room it'll change. Just hit X from the objects menu to change the type of sorting filter. If you're doing the same item across lots of rooms, don't filter by room as it will change every time you hover over a wall!