I just sent another bug report a few minutes ago here is a follow up:

Of the (default) back/forward buttons under the horizontal scroll wheel:
VSCode Specific Settings: CTRL+SHIFT+E Does not work

BUT if I change the global mouse settings for that button to CTRL+SHIFT+E it does work in VSCode.

So bug is something like options not detecting that VSCode is open properly (i tried it in admin + regular user VS code). Please fix.

To reproduce:
1. Open VSCODE
2. By default CTRL+SHIFT+E shows files and CTRL+SHIFT+F shows find (left sidebar for both)
3. Try VSCode specific keybinding on mouse button CTRL+SHIFT+E (or F) and it dosent work.
4. DO the same keybinding but on global mouse settings, and it does work