I bought exactly this set of shifters, latest SLX model.
I had similar SLX shifters, just the older ones, where the front one had a little button so it was easy to change from 2x to 3x.
Now this new one has nothing on the bottom or at the top, I do not see any kind of hint on the internet, how the hell can I change this shifter to 3x?
Here is all the info Shimano provides, but there is NOT a SINGLE WORD about switching into 3x mode.
This is a hilariously minor problem, which still cause a pretty big trouble to me.