In case all cards are studied, I suppose the following message is shown after tapping the deck again.
![Screenshot_2024-04-02-00-03-37-43_fa11baa8cf97fb058a8216ef334c7693.jpg](https://groups.google.com/group/anki-android/attach/2c7729a853e8e/Screenshot_2024-04-02-00-03-37-43_fa11baa8cf97fb058a8216ef334c7693.jpg?part=0.1&view=1)
As you may feel, this criteria is not necessarily very convenient for your purpose. It may be improved in future.
Regarding the congratulation screen, the option to show the screen is also not shown in 2.17.6, by default.
You can find the option after tapping the app logo 6 times in 'Settings' > 'About' screen.
Best wishes