How to normalize TH2?

Hello, I am trying to normalize TH2F histo but I do not find anything. I explain. To normalize 1D histo, I use Scale or I plot my histo with something like that

where “norm” is my normalization factor.
I would like to do the same thing with 2D histo, i.e. my 2D histo is normalized against Z-axis.
How can I do that? Thanks.

Sorry for the inconvenience, but in fact both method work fine. :confused: