how do i fix mouse double clicking properly?

before giving up on it, check the double click speed in mouse settings isn't set really slow - that can make two separate clicks count as one double. and if it's still in warranty, claim it, a worn switch is a known fault on a lot of mice.

If it's double clicking on single clicks the switch is worn, not the software. compressed air into the button gap sometimes buys a few months. otherwise it's a switch replacement or a new mouse - windows settings won't fix a mechanical fault.