The numbers follow the marks
A marker's number is its place among the step markers. Delete the first of three and the remaining two renumber automatically; undo restores the sequence. That keeps you from manually relabeling a screenshot after one correction.
Keep a sequence short
- Enable Step numbers on the Features page if it is hidden.
- Open Edit and place markers in reading order.
- Apply the marks and check that every number is visible at the final viewing size.