Hi @Gev Ananyan ,
Are you getting any errors getting the Library ID in SharePoint Library Settings using the web browser you mentioned in your post? Or did you encounter any difficulties. If it's easier, you can provide a screenshot of the problem or your procedure to help you troubleshoot it.
In addition, Other methods to get Library ID:
1.You can use PowerShell to Get Library ID in SharePoint Online( Replace your library name):
#Connect to PnP Online
Connect-PnPOnline -Url "https://m365x73359689.sharepoint.com/sites/xyzax" -UseWebLogin
$library = Get-PnPList -Identity "lib3"
$library.Id
2.You can get the ID of a Library using REST API:
https://yourdomain.sharepoint.com/sites/sitename/_api/web/lists/getByTitle('libraryname')
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