When looking at the documentation for navigating between tabs , the docs state:
To navigate from the current tab to the next or previous tab
Right-click the current editor tab and choose Select Next/Previous Tab on the context menu.
Press ⌥→ or ⌥←. So doing, the focus moves to the editor tab located next to the right or to the left from the active editor tab.
However this doesn't seem to work on OSX(default OSX only keymap). Pressing Alt+arrow in the editor just moves the cursor around to the end of the next word.
There a quite a few other examples in the docs where the keyboard shortcuts seem different.