Tablet on Window

Go to Preferences >Tablet Library

This option let you select input used by “3DCoat”. Switch between two tablet libraries: “WinTab” and “Tablet PC”.

Currently “3DCoat” uses “WinTab” which will work only if you will install Wacom “WinTab” driver.

When using “Tablet PC” library which should work without additional Wacom “WinTab” driver. 

Also remember switching this icon to pen (pressing LMB over the icon) 

This old video show how to setup Tablet sensitivity on Preferences