One of the violinists in 2 Star Symphony is a lefty. Here is a pic of him playing.
He’s playing normally.
I’m pretty sure that most of my fellow lefties play it “normally”. 
I think that was the point.
Dougie_Monty
A “left-handed” computer mouse? It’s just a matter of changing computer settings unless you are talking about the fancier mouse styles with a slight indentation on the left for the index finger.
My mom has her mouse set up for a lefty. Makes it damn hard when I need to use it (rarely, but not unheard of). I’ve also known a lefty or two who moused right-handed because that’s the way they first learned it. I can’t imagine mousing left-handed, so I don’t know how they did it.
Because I’m the only leftie in my family, the computer was set up with the mouse on the right. So that’s how I leaned to use it. I’d find it almost as uncomfortable as a right handed person to use the mouse with my left hand. (Although on the touchpad on my lap top I use my left hand.)
I suppose it would be different for older left handed people, who didn’t have computers as they were growing up. And therefore bought and set up their first computers themselves, and would instinctivly put the mouse on the left.