If I create a new item on any site (team or sub), the item has a default list of users/groups that can read/edit it. How can I change that default list. (For example: removing "Everyone except external users" from the default list.)
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By default, all sites, lists, and libraries in a site collection inherit permissions settings from whatever is directly above them in the site hierarchy. This means a site inherits permissions from the root site of the site collection, and a sub site inherits permissions from its parent site. A list inherits permissions from the site that contains the list. A list item inherits permissions from the list to which it belongs. If the default configuration is not changed, permissions are inherited throughout the whole site collection.
To break inheritance for the list and restrict access to it, follow these steps:
Here are some important things to note: