Header numbering is fine for the first 3 levels.
But, my level 4 headers are not of format A.B.C.D - only D, where D starts at 1 and increments throughout the document, not resetting when higher header levels are encountered.
E.g, if I were to add a level 4 at the end of the example shown,I would expect it to be 18.104.22.168, but I see only 1.
I have searched and tried things such as this, but they are all very complicated.
Is there a simple way to fix my problem? MS Office pro 2016, if it makes any difference.