p.s. i don't think the adobe website, and forums in particular, are easy to navigate, so don't spend a lot of time searching that forum list. do your best and we'll move the post if it helps you get responses.
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Google translation: "When we select the photos from the library Is there a way to crop directly from the library .... otherwise that option would be fine"
You can apply a crop aspect ratio using the Crop Ratio menu in Library's Quick Develop panel on the right:
If you want to apply a crop ratio to more than one photo at a time, make sure you are in Grid view and not Loupe view (otherwise, the ratio will be applied to the current photo only).