So if you have this, and you want their size to remain the same, you would NOT change 0.900 since that is their height.
If you want them to walk across in a straight line, you would NOT change 90 which is the “floor level” they are on. For example, if you wanted a character to walk from the top of the screen to the bottom of the screen, then this number would be changed.
For making them walk in a straight line at the same height, only the number 50 in this example (the X- axis, left to right, which way they are walking) would be changed. You can see what number you should put for the middle digit by testing out your spots on the web previewer or mobile.
No I just used that as an example, the thing to focus on is that the Y axis is the same. Unless you’re trying to have a character look like it’s walking up or down, then you should play around with the Y axis.