Board Thread:Support Requests - Getting Technical/@comment-4881909-20200303052219/@comment-44807868-20200303053220

I fixed it. The correct classes for collapsing are, not. Koei Wiki's navbox uses custom JS for collapsible elements which happens to make use of custom  classes, but since La Corda d'Oro Wiki doesn't have the JS script in question, it didn't work there. I'm not sure why Koei Wiki doesn't use the default collapsing classes instead, but these should serve your purpose sufficiently.