Clicking hyperlink closes source file?

[mkopen]

Hello all -

I forget who asked this question recently, but I don't remember reading an
answer: Does anyone know why sometimes when you click on a cross-file
cross-reference the source file closes and sometimes it does not close? 

MI want the source file of the link to stay open. Is there a setting somewhere
for that, or is 'close source file' a default that cannot be changed?

Cheers,
Mike

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Michael Heine
London, ON
Canada