Hi @MURY,
As explained in this article: Default Permission Levels, "Limited Access" enables a user or group to browse to a site page or library to access a specific content item when they do not have permissions to open or edit any other items in the site or library. This level is automatically assigned by SharePoint when you provide access to one specific item. You cannot assign Limited Access permissions directly to a user or group yourself. Instead, when you assign edit or open permissions to the single item, SharePoint automatically assigns Limited Access to other required locations, such as the site or library in which the single item is located. This allows SharePoint to render the user interface correctly and show the user some context around their location in the site. Limited Access does not grant any additional permissions to the user, so they can't see or access any other content.
"Limited Access" permission doesn't actually give the user the ability to see those items but is instead used under the covers to make things work (rendering the user experience, etc.).
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