How to bind checkbox visibility - save value

First of all thank you for the answer.

I’ve disabled the bind of the checkbox value in the desing tab, as you recommend. I’ve connected the “Assing CheckedStateChanged” node to Event Construct. In “Assing CheckedStateChanged”, in the Event pin which reference I’ve to connect?

Thank you so much for your help, I’m a bit lost.

Sorry about my english.