Is there a way to show an entire field that is truncated in the packet details pane, to expand to show all the characters instead of it being cut off with ...?

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Byte streams like these, of indiscriminate length, are always limited in size, since they don't add much relevant info to the packet details. If it would then the data should be probably be interpreted anyway.

As for a view on all bytes of this field, see what's being highlighted in the packet bytes pane. Hopefully that's something that can be picked up.