Back in February we announced the availability of the Editor Pane (see Editor pane now available for Office 2016 Insiders Slow), and you’ve been really helpful in providing us great feedback. We are continuing to improve the experience and based on your feedback, we’ve addressed the issue of the buttons moving around in the Editor pane, etc.
The improvements are now available to Insiders Fast in Version 1709 (Build 8509.2001) and we’re anticipating an automatic rollout in the September release to Office Insiders Slow audience. Again, thank you for the invaluable feedback and your active participation in our Office Insider community. Please try it out and let us know what you think. We’re listening and will continue to address issues and make improvements to our product.