Did you change any access right ?
Did you change any specific access right ?

What did you do between time it works and time it does not anymore ?
(even if it does not seem linked to contact)

I didn't change any rights or access right.

Th only changes I made is on the screen "Project" with the plugin ScreenCustomization, to aloow the display of a field for a certain type of project.

I don't know if it could be this modification that create the problem.

I've made another test : if I create a new project, I can choose a contact in the list : all the contacts are visible. But in old projects, I can only see the contact input at the creation of the project

And n the screen "Contacts", I don't see everything (but only with my login) : if I log me withe another profile, the contacts are presents....space :blink:

Try and "reset" the display of colomns to default value (through colomn selector)

It works , thanks :-).

I know maybe causeof proble : I have (but why ?) two fields "Titre et fonction" : with one of them selected in the view, nothing appears on the screen. Withe the other, it works correctly.

How is it possible to have 2 times the same field in the seletor of columns ?

How is it possible to have 2 times the same field in the seletor of columns ?

It may be possible if you customized screen Resource.
Then some field renaming will keep old field name in the customized screen.
Remove the unxepected field is model/custom/Resource.php will remove this unexpected behavior.