The "collections" column on the reader display contains the corresponding values from the "Tags" and "Series" columns in the Library display. These are metadata values that are used to mark the ebook as being a member of a collection sharing some user defined attribute such as Horror, Sci Fi, Romance, Mystery, etc.
You must set the ebook's "Tags" and "Series" values in Calibre before transferring the ebook to your reader. Once a value is set, the ebook becomes a member of the collection named by the value. You can have multiple values in the "Tags" field, each value creating a collection, but you can only put one value in the "Series" field. The "Series" field also allows you to specify the number of the ebook in the series.
There are at least three ways to enter values into these fields to create collections:
Press the "Edit meta information" icon at the top of the screen,
or highlight a row in library display mode and press "e".
or double click the "Tags" (or "Series") fields for an ebook in library display mode for direct entry.
Hovering over a data field in edit mode will pop up a help box describing the purpose of the field.
I hope this helps.
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