You need to do a ramp test, it is necessary to determine the exact focal point of just your setup. There are many videos on youtube that explain it better than I can, but it is very simple, you make a line in LightBurn, for example 200 mm. On the laser bed, place a piece of wood at an angle, approx. 20mm in height difference between the ends. Now you burn the line with moderate power and about 800 mm / min or whatever suits your machine best. The point on the line which is the finest indicates your best focus. Measure the distance from this point to the nozzle and you can compare whether the supplied gauge fits or whether you should make a new one.
But, that’s not what I mean when I say that you have to find out if your laser beam breaks in the nozzle, here you have to drive your bet all the way to the bottom, make a shot and raise it to the highest possible and shoot again , here there must be no difference, i.e., they must center both.