How to move focus across editor slides?

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If you want to move between open editors within one split then Next / Previous Document in the Window menu. If you want to move the focus to another split then Move Focus in the Window menu (although that also visits tools). Those should show key bindings.

Alternatively, you can move focus just between editor splits (without visiting tools) with the commands move-editor-focus, move-editor-focus-previous, move-editor-focus-first, and move-editor-focus-last. These can be bound to keys using the User Interface > Keyboard > Custom Key Bindings preference.