Children rarely decide how they feel about Quran class on their own. They read it off the adults around them — from how the lesson is announced, what happens if it goes badly, and whether it is treated as a chore to be survived or as something the household values.
Start with the framing. "Time for your class" lands very differently from "Hurry up, you're late again." A calm, fixed slot in the day removes the negotiation that turns a lesson into a battle. Children accept a routine much more readily than they accept a request.
Be careful with praise. The instinct is to praise fluency, which rewards the child for what is easy rather than for what is hard. Praise the effort you actually saw: coming back to a difficult letter, sitting through a correction without sulking, finishing the page when they wanted to stop. That is what you want repeated.
Corrections need a lighter touch than most parents expect. A child who is corrected at home immediately after being corrected in class hears the same mistake twice and concludes they are bad at this. Let the teacher own correction. Your job at home is the five minutes of unpressured reading that keeps the material warm.
Keep an eye on the length of the session relative to the child's age. Younger children concentrate in short bursts, and a lesson that runs past their attention span teaches them that the subject is exhausting. If a class is consistently ending in tears, that is information for the teacher, not a discipline problem.
One last thing that is easy to miss: let them hear you read. A child who never sees a parent open a mushaf works out fairly quickly that this is something children do until they are old enough to stop.