None of this is required. It only exists so the app can tell you when a recipe needs something you have not got.
A night you never cook on is not a gap in the week. Turn it off and it stops being offered, here and when the votes go on to days.
Dinner always. Breakfast and lunch only if they are worth deciding in advance, which for most weeks they are not. A holiday week turns them both on without changing any of this.
How many pans you can have going at once. Leave it at zero if you would rather not say.