In admin panel, List means you can add placemark's IDs, separated semicolon to show it (for example, from different maps)
Filter - you can restrict access to placemarks (for example to view). Each placemark has user attribute, who created it. By default it is not set.
As for table. It is not well developed, because now bootstrap library is differs from joomla's
Look at my demo
Now I disabled image gallery and loading JS files for bootstrap, because if I enable (in admin, menu item) property "Load Bootstrap" the filter is not correctly
work, it appear and hide.
Now setting is
And when you press filter button
You'll see filter and can restrict results
If you click on placemark title - you'll get placemark details (you can configure what you can see there. It is in menu item properties in placemark details section)
When I find more time I'll try to fix PlacemarkList menu item to correct work at all.
PS Today I have to fix "bugs" in plugin call, for cases using detail show information and enabled ajax loadimg map objects.