This feature is available as part of Telegram Premium.
An option to pin one of your folders as the main folder instead of All Chats. When you open the app, it would show you the folder you chose. Pressing the back button would bring you back there when you're in another folder.
- You can Archive chats to keep your "All Chats" folder free of clutter. Folders can be configured to display those archived chats that you need to access more frequently. This way you will have a clutter-free chat list but will not miss new chats when they appear.
- If you are getting too many new chats, Telegram will offer you the option to automatically archive new chats from non-contacts.