Enable Collapse of Properties

I’ve been tagging rem for inclusion in a table (e.g. my ToDo LIst). When I populate any of the properties, those properties show up as child rem. This is sometimes useful, but in general it adds to clutter on my screen. However, there is no “collapse” arrow to collapse the display of these properties (or are they child rem, or are they sometimes child rem if I turn them into a template — I’m a little confused on this point). The collapse arrow does appear if I add an actual child, at which point I can also collapse the pseudo-child property.