Your mac may then ask you to identify keys on either side of your Shift keys - do that and it should just recognise an ANSI / US style standard keyboard. The solution I found was simple and reliable - just plug a basic standard corded IBM / Windows keyboard into a USB port on your mac (if you have a wireless keyboard already paired leave it connected - just leave it alone while using the Windows keyboard). The problem is that Options+ has difficulty recognising multiple keystrokes in its keyboard options input field - you have to try and hit the 3 keys exactly simultaneously and that is really hard - you might fluke hitting 3 at exactly the same time, but mostly you won't achieve it. Or example in Excel for Mac the 3 keystrokes needed to jump to the first top left cell in a worksheet are - that works on an Apple keyboard, but is hard to remember and ideally should just be allocated to a single button in the Excel menu in Options+ using an MX mouse. So I have to live with Logi driver.Apple keyboard users may have difficulty in creating and allocating multiple keystrokes into a single keyboard shortcut in Options+ onto a button on an MX3 mouse. After killing the driver deamon, the 4/5 keys work in vscode, but other custom keys dead. Although it works on chrome, it doesn't work in vscode.

I don't have that software running, but indeed I am using Logitech Options driver, which might rebind my 4/5 keys to some other keys called 'forward/back'. I'm not sure if we are able to make swipe left/right gestures of Mac to be navigate-able in VSCode. Seems that because of the SensibleSideButtons bind the Mouse 4 and 5 to the swipe left/right gestures so It doesn't work. I tested and this feature only works with SensibleSideButtons disabled, so I have to choose between firefox + system navigation or VSCode navigation. If you have SensibleSideButtons running on your mac, try to turn it off.

Do I need to turn on some settings? Thanks! I have upgraded to 1.43 stable version on mac, but my 4/5 buttons still doesn't seem to work.

Logitech mouse mac keystrokes