Looks like maybe ZColor https://help.maxon.net/zbr/en-us/#html/user-guide/zbrush-plugins/zcolor/zcolor.html?TocPath=User%2520Guide%257CZBrush%2520Plugins%257C_____17
I remember this type of color bar for zbrush and wondered why it wasn't the default especially since it adds "cleanliness" to the u.i. for me, especially when customizing the u.i. for your needs.This (from whomever posted it 10 or so years ago, is the bar i am speaking of but it wasn't as long/big, still fine if that is…