Présence de la barre horizontale après sortie de l'image traitée

Hi ​@Farid25682661zaad, Welcome to the Lightroom Community forum! I am not sure I understand the issue from the screenshot you sent. To better help you, we would like a few more details. 

1. System Info: Your system info can be obtained by going to Help > System Info, copying and pasting it into a text file, and attaching it here.
2. A numbered list of the exact steps needed to replicate the issue.
3. Expected result - what should happen after executing the last step.
4. Actual result -  what actually occurred after the previous step.
5. If possible, a screen recording or screenshots of your work area.

Once we get that information, we can help you troubleshoot the issue. Thanks! ^CH