customization of the field "priority"

Summary

How can hide the field "prirority" when i add a goal in the perfomance module

Content

Hello,

in the performance module when i click on the button "add" in the performance document i have a pop-up with the detail of the goal that i'm going to add. I would like to know how can hide the filed "priority" into that pop up.

 

You can see in the screenshot attached which is the field that i want to hide.

 

Thank you,

Giulia