Hello Olga,
On the desktop, it is possible to switch between profiles.
Profiles are used to manage completely independent accounts, associated with different email addresses.
This is helpful if you want to share a computer between two different individuals.
This feature is currently not available on AnkiDroid.
An alternative that you might want to experiment with is to associate different deck options with different decks.
I am not sure if it is possible to set maximum limits for new and review cards to zero and so, in practice, disable a deck.
Note that deck options are shared between decks: I would try to create two sets of deck options: active and inactive.
Then assign the options to the different decks, based on which you want to be active and inactive.
I would suggest creating a couple of small decks for testing and try this out on the desktop instead of AnkiDroid.
If this works, the deck options will be actually synced to AnkiDroid as well, and you might be able to do something similar to what you used to do with Anki 1.
As I said, I have not tried it, so I am not sure if it will work.
-Flavio