Remove opt-in from an account

I have read @ryanRfox work on ASA using JS (link) and at the last portion it shows that those accounts having opt-in an asset will still see the Asset in their account after the asset is destroyed.

How can an account remove this opt-in asset in JS? Or alternatively it can be removed in Algosigner (currently we can add Asset but cannot delete Asset in Algosigner).

Thanks in advance.

kc

Thanks for your prompt help. It works fine.