I'm physically limited and solely have functional use of my left hand.
I previously used a Razor DeathAdder Left Handed Edition and am now making do with a Logitech MX Anywhere 3 that has to be set up as a new mouse every time I reboot between OSes! Additionally, despite the manufacturer classing it as an "Ambidextrous" mouse the two side buttons are only on the left side!
I need a left handed or truely ambidextrous mouse that can be used in Mac and Windows mode without reconfiguration and also allows redefining button assignments in both Mac and Windows!
Best Answer
Contour https://contour-design.co.uk/products/one-handed-mice/unimouse/ has left-handed mice but only 5 buttons and a scrollwheel which is also a button.
For the mac it needs no configuration. It does have a driver that allows some configuration.