Disabling join/leave notifications not working in development environment

I’m setting DISABLE_JOIN_LEAVE_NOTIFICATIONS to true and run Jitsi Meet with make dev.
However, I still get notifications, when a user joins or leaves a call.

I’m using stable/jitsi-meet_6865.

Any idea why that setting might not work?

When using the development environment, it uses some deployment for the backend and uses its settings, you need to change the setting in that deployment.
Another option would be to use iframe API for those settings you can override.

In addition to what damencho said, note that controls for notifications have been moved to config.js. You need to explicitly specify which notification(s) you want to enable in this array (first uncomment it), otherwise, the default setting of all notifications persists.