In anki you have three rating option for new cards and four for matured cards
In RemNote however you have four at all times
So what RemNote does is make the hard button act like the good button for new cards. I personally don’t like this and would prefer if hard did the exact same as the again button because I press hard only if I got a card partially correct and the good rating is therefor unfitting. I’d suggest you add a switch in the queue section of settings that lets you change that.