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The ['interface'] section contains configuration for display and listing in various parts of the backend. Extension authors often ignore these settings and a lot of extensions in the wild don't use that array part.
This is how the "pages" table is configured for these settings:
'interface' => [ 'maxDBListItems' => 30, 'maxSingleDBListItems' => 50 ],
Max number of items shown in the List module. Defaults to 20 if not specified.
Maximum number of items shown in the List module, if this table is listed in extended mode (listing only a single table). Defaults to 100 if not specified.