The "1X" is the label for the collection. There are a couple of things to note. One is that you can right-click and edit the label "1X", changing it to something meaningful. Or you can suppress all collection labels in the visibility switches.
There is a bug in version 8.1.3 where the visibility switch doesn't respect the child settings. If you want this off, make sure the parent level has a clear check box as well as the child. Right-click in the visibility settings and save this to your job properties.
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