Quoting mediadogg:

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the column is available in the collection tab

Location Description, yes, but not Location ID.

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how can you distinguish two entries in your table that have the same Disc ID, but different localities?

I can't, but the probability that anyone would have 2 (or more) Disc ID profiles with the same ID but from different locations is so low that I don't think it matters. Anyway, double clicking the row in IdCheck will take you to the correct profile.

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Adding to collection "multiple", and flag sets, both use the internal profile ID format, including the locality suffix with the US exception. While not explicitly in the UI, anybody who uses those, must understand the format.

Not sure what you mean by collection "multiple", but it's not necessary to understand the format for using flag sets, unless you manipulate them outside of Profiler (which I assume that most users don't do).