If you're using it as part of a launch command, then ditch the 'export' and the &. Just use something like:
CALIBRE_USE_DARK_PALETTE=1 calibre
The 'export' makes it semi-permanent (for the duration of the current open terminal say). That's better for use in a .profile file or the like. The Calibre binary clearly needs to be in your PATH using the the above start command.
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