Each Style has a Master Volume option. You need to find one Style that is optimal (not too loud and not too quiet), then adjust the volume of the other styles according to that Style
Of course, everyone has different vocal abilities, but in this video I'm talking about options and not about the setting that suits each vocalist. So I don't advise musicians to copy my setting for their vocals, but I explain to them where and what to do to get the desired result.
Usually you don't need compression on the vocals, but here we are talking about very little compression, almost none, but I used the possibility of raising the vocals more, until I almost didn't use the compression itself.
As I said, don't try my setting, but the way of thinking during the setting and make it according to your own voice. First of all, my GAIN and yours are not the same, then everything else. No one should copy my setting, but workflow.