I replaced my MS List as my data source.
Now, one field, a choice column, is not recognize in power apps :
Why, suddenly, it cannot recognize "Lieu" ?
For this form field, use a dropdown.
For the other columns, the Default property works (ThisItem.Visiteurs, and ThisItem.SelectedDate).
The internal name is "field_1" (url in settings : ...B21FACB118%7D&Field=field_1)
But still errors using "field_1".