When I clic on the magnifying bouton the field show all the search I would like to know if it s possible to show nothing if nothing is written in the search field ? if yes can you tell me how to do it.
Well, there is an option on the General Options -> Logic & Behavior panel which allows you to change the minimum character count to trigger the search: https://i.imgur.com/wZQpxZW.png
If you change that to 1 or more, it will prevent the search from triggering, unless at least that many characters are entered.