When you are using Num Digits to modify a value of a fillet weld feature (simple, two-sided, or reinforcing a groove) that has differing leg length values shown in the symbol, such as "L1 x L2," the number of decimal places shown in the two values are linked. That is, if you select this portion of the symbol for modification, the system highlights the entire "L1 x L2," and both values change to the number of decimal places you specify.