When you SubDivide a model in Zbrush you loose size.
In this video we will create a macro that uses morph target to keep the size of your mesh as close to the original as possible.
Macro Download Link: https://gum.co/cOWRM
Simply drag the zipped contents to your Pixologic\ZBrush 2019\ZStartup\Macros\Misc folder and restart Zbrush
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