This is extension removes the ability to like (or unlike) posts on a locked discussion.
There are no settings. Just enable the extension in the admin panel.
composer require clarkwinkelmann/flarum-ext-lock-likes
This extension is under minimal maintenance.
It was developed for a client and released as open-source for the benefit of the community. I might publish simple bugfixes or compatibility updates for free.
You can contact me to sponsor additional features or updates.
Support is offered on a "best effort" basis through the Flarum community thread.
Sponsors: HereWeLink, GreXXL