Quick sizes never enlarge
The preset sizes only ever make a photo smaller. If your picture is 1200 pixels across, the 1920 px option is left off the card instead of blowing it up, so it never turns soft by accident. You can also scale by a percentage, such as 25% or 75%, to shrink both sides evenly.
Enlarging is possible, but only when you ask for a specific width and height. Making a small photo larger cannot add detail that was never captured, so expect a softer result.