[two_handfuls]

I wonder whether this could be a touchpad malfunction, causing phantom clicks that move focus. To diagnose, you could temporarily disable it and use an external mouse.

[cpt_sobel]

I've had the same issue while using external mouse and keyboard, so I definitely don't touch the touchpad.

[two_handfuls]

But was the touchpad disabled at the time? Phantom touches could happen even if your hand is not near the touchpad.

[lloeki]

I have similar behaviour on a Mac Mini, and only since Tahoe.

[shlant]

a touchpad malfunction that only happens after an OSX update?

[plorkyeran]

Yes, there is a very large amount of software that's involved in making touchpads work and that software is part of the OS.

[Avamander]

External mice also suck with macOS though.

[vladvasiliu]

Depends on the mice. As a sibling says, Logitech mice with their drivers work great. The app isn't great and loads a boatload of javascript crap. Can't vouch for bettermouse, never tried it.

Another option which sidesteps the Logi Options crap is Logitech "gaming" mice. These have an integrated memory that actually remembers the configuration set by the driver. So, you only have to put up with the shitty experience once, and then the mouse remembers those settings wherever you use it. Some models can actually remember multiple setting sets.

One of my best mice is a G700s. I haven't used the Logitech G crap in like... ten years? The mouse is still going strong. Its only issue is that it goes through batteries like a hot knife through butter. I like it so much, I actually bought a second one for work. Got it used, since they weren't making them anymore.

[Arainach]

Not sure why this is getting downvotes, it's absolutely true. For a very long time you couldn't even set different scroll directions for external mice and the touchpad - even if it's (maybe? I forget) supported now it's always been an area Apple didn't care about and was far behind Windows and Linux.

[TheCleric]

I have a Logitech MX Vertical and it works flawlessly.

[jjtheblunt]

i have a logitech mx something and it's absolutely awesome.

[varenc]

I have a great time using my G502 on macOS, but I absolutely rely on SteerMouse to configure its behavior.

[Joeri]

You have to use third party software to configure them properly, then they work fine. I used logitech’s drivers for a while but they’ve become the biggest pile of garbage I have ever seen call itself a driver. I now use BetterMouse instead.

[whywhywhywhy]

It's not, it's just increasingly badly made. Started creeping in the release before Sequoia