Foliage edges turns white in Unreal Engine 5


Hi, and I have been tried for days. No matter what foliage I added to UE, they all seems good closely but becames white far away, and examples level have same issue. and if I follow all kinds of tutorials on udemy or youtube, the final effects always different with the vedio. seems I missed some setting, but I have tried all toggles I can find in the UE editor