marquer plusieurs photos en meme temps

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"I would like to mark several photos at the same time to apply the same parameters.

I can only mark them one by one with the P key."

If you are in Library Loupe view or in Develop, with a single photo showing in the main panel, and you select multiple photos in the filmstrip at the bottom, most commands will only operate on the current (most-selected) photo, not on all selected photos.

Options:

1. Go to Grid view (multiple thumbnails showing in the main window), and then the commands will operate on all the selected photos.

2. Click on the toggle in the lower-left corner of Library to turn on Auto Sync:

But be careful -- if you forget that it's on, you could accidentally make changes that can't be undone.

I can select several or many photos in the Library Grid view and then press P and they all get marked. So I can't reproduce the problem. Windows 11, Lightroom Classic 12.3

What software are you talking about? What version NUMBER?