MonoDevelop will not autosync with Unity

I don’t know what I did, but MonoDevelop no longer automatically syncs with Unity. I now need to go to -> Right Click -> Sync MonoDevelop Project for my code changes to be reflected in Unity and, by extension, in my game. It’s not a blocking issue, but it is very annoying – especially while debugging. How can I fix this?

hop this will help unity preferences should be like this i searched and i found this.

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