Double clicks when I just want single click

You should move the slider the *other* way! To the left means a slow double click is accepted, to the right means you need to be quick or the second click is taken as a separate click, not double-click.

The software could affect both. Input devices that don’t use the built-in framework might be intercepting the clicks. You didn’t say you disabled the drivers. The only effective way to disable them would be to completely uninstall them.

I’ve never seen a problem with the built-in mouse system except when the device is bad or some third-party software is interfering.

Are you sure it’s double click and not force touch? I don’t think I’ve seen anybody misinterpret that as a double click, but it’s the only other thing I can think of.

In System Setting >> Mouse.

Enable the Secondary Click as per image below

Then Light touch the file in question and Right Click

It will bring up a Sub Menu and is the functions presented

It could be the Kensington software, if you have any installed for that mouse.

+1