In the new Pages app, I can press CMD+OPT+E to insert a new equation:
and then press CMD+ENTER to insert it:
That's super convenient, because it allows me to insert equations quickly and efficiently (hands can stay on the keyboard and don't require using the mouse/trackpad).
Now, the issue is how I can edit an equation. Say that the cursor is immediately after the equation, one can use SHIFT+LEFT-ARROW to select the equation:
However, I cannot find a way to open the equation for editing except for using the mouse/trackpad to double-click. Is there a keyboard combination to do this? When I press CMD+OPT+E, it will open the edit menu for a new equation instead of opening the current one for editing.