Microsoft Copilot (Microsoft 365): Updated UI for Copilot Chat entry point in Word, Excel and PowerPoint apps

We are updating the entry point user interface for Copilot Chat. The Copilot Chat entry point button will move out of the app ribbon to the app canvas to help with discoverability and use within the context of the file. This update will apply to Microsoft 365 users of Word, Excel and PowerPoint who are eligible for Copilot Chat across web, mobile and desktop.