General parameters > Chapter Supervisor > Parameter CALNBRDEC (Calculate number of decimals) 

Use this parameter to define the default number of decimals proposed in the calculator. You can modify this number when using the calculator via right-click > Decimals.

Level of localization / Global variable

This parameter is defined at the level User.It belongs to Chapter SUP (Supervisor) and the Group INT (User interface),The following parameters are also associated with this chapter and group :

The global variable GCALDEC is associated with it.