Easier to show than to describe but... From bow hand wrist, bow pressure runs straight up the bow arm (elbow straight -- NOT locked) to the bow shoulder, then that straight line continues to the string shoulder at full draw and then out the string upper arm to the elbow. That straight line crosses the arrow line, it does not run parallel to the arrow.
When done correctly, when you reach full draw and anchor, you will feel the bones take the weight of the bow, your muscle activity will decrease to just that required to hold the bones in line and will be in the back, NOT the arms. It is ALMOST like hitting the let off on a C bow as your effort largely reduces to much less than bow weight.
To complete this, it helps immensely IF your string forearm and wrist are as relaxed as possible too.
Another way to think about it is: when you are standing, your body weight is on the bones of your legs and your muscles are only keeping the bones lined up they (the muscles) are not supporting body weight only bone alignment. You can get that feel in the upper body with the bow too, BUT there are more bones to keep in alignment and that is why we (coaches) so often say that it is easier to learn this with a light bow first. Once learned, you can apply the feel to much heavier bows.
Overall, IF you can develop this, and since your bones are always the same length, your draw length stays essentially the same, no matter the bow you are using. And consequently, where you anchor on your face becomes a RESULT of your draw to align the bones and NOT an arbitrary point that you draw too and then conform your body too.
Arne