Changing excerpt length

I have not been able to get this change to work.

I am looking to change the length of the preview excerpt when someone on my forum pastes a link to another topic on my forum. Basically, the length of this (only for posts within my forum):

Right now, the preview is very long (400 characters). I have tried changing both the “post_excerpt_maxlength” setting, as well as the “topic_excerpt_maxlength” setting. Neither made a difference for this–including for new topics created after the setting was changed.

How can I adjust this setting to make the previews shorter when I link to another post on my forum?

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