Hi @kaden-stytch - the Sidebar, and a few other parts of Discourse, are using a more modern approach for handling templates (Ember’s Colocated Component Templates). Right now we don’t have any way for them to be overridden from themes/plugins, but it’s something I have on my list to improve.
I’ll let you know once we have a solution. Fingers crossed that’ll be in the next couple of weeks.