@Françoys0If you do not want guest leave/arrive on same day, set your "preparation time" to 1 day, it will block 1 day before/after each reservation. But if guests can book on same day "old" guests leave, set you check-in times in a way they do not overlap and also create for yourself a timeslice to prepare the accomodation. So it's all in your own hands and has no relation with Airbnb algorithmes.
(Please note there is also a community for French language: Community Français )
Hope this helps,
Emiel