[GNC] Dark Theme?

[Indiana]

Greetings and salutations.

I am using Ubuntu 22.04.5 and GNUCash 5.1 .
How do I put GNUCash into dark mode?
I have Ubuntu's appearance set to dark. In GnuCash preferences I have tried selecting and deselecting "use GnuCash built-in color theme" with no change.

Thank you for your help.

Sincerely,

Gividen

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