duplicate the list and remove filter from duplicated list. Go to userview create new category and add permission 'Is Admin' and call the duplicated list which as no filter.

this solution is for the list to be seen only by the admin 
Does it deal with the fact that i wont the current user to see only his list?

If client want to see his data :had filter, use hidden value and keep "#currentusername#" in default value

yes

thank you very much

pleasure : )

I'm so sorry for disturbing you but i can't make the list lines created by current user seen only by the current user.
Your solution worked for the fact that the admin should see all the lines but not for the current user

create two categories. In first category call the list which contain filter and in second category call the list which does not have any filter.

I've tried it for the admin to see everything . but i cant see how that can help me to make the current user see only the line that he created 

I've seen some people saying that we should apply a certain filter in the second category written like that :  customProperties.name = "#currentUser.username#"? but i don't know where to write it

list→ source ->advance

this image might help u

you're a life saver 
Thank you so much 
It worked 

Glad that u tried : )