Creating a unique group for 1 document library

[Bryan365]

On my SP site, it's read only for everyone but I now need to grant edit access to one Excel file so I created a new document library to store the Excel file.  Now I need to give access to that library to only certain users.

I created a new group

I went into the document library and updated it so it would stop inheriting permissions.

I then added the users to that new group.

But now, that group is listed in all of my other document libraries along with the users I added to it.  How can I only have that one group appear in that document library?

[#2 · Accepted solution]

@Bryan365 Did you provide any site permissions to SharePoint group when you created it?

You should not grant any permissions to group on site while creating it: 

You can directly grant permissions on library after breaking permissions inheritance: Customize permissions for a SharePoint list or library 

Similar thread: How to assign a Group to a specific folder in a Document Library via Manage Access? 

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[#3]

Thank you