I have a deck in anki with some news cards. When I am studying, I put a 4 days interval.
But, after starting to studyng this news cards, I noticed that the 4 days interval dont keep in on. Isteand of this, the interval randomic change to 2, 3, 4, 5 or 6 days.
I want that this dont stay in this way! I want that anki show me only the 4 days interval.
It sounds like what you’re noticing is Fuzz Factor – Studying - Anki Manual . It’s there for a good reason, and it can’t be removed.
There isn’t anything magic or exact about the 4 days you’ve chosen for your (Easy?) interval, right? On an interval of that length, it’s not likely to fluctuate by more than +/- 1 day.