[SOLVED] [Projects] Proposition tab in custom fields not visible

Hello,My chief while printing one of the project noticed some fields  "Strength", "weaknesses", etc that were not visible on the projetcs while doing them

 

But when I go check using Customization, It is hidden by default and cannot be used and he was thinking that he could use them to have some way to tell if a project could be difficult to do or not, etc

 


Could anyone tell me what it is and how to show them ?

Thanks