The Outlook Classic Ribbon for Office 365/2019/2021 consists of various options and commands that are used to achieve the tasks in Outlook. For example, you can click buttons on the Outlook Classic Ribbon to
Create a new email
Delete emails
Open a new meeting request
Assign a category to an item.
To switch back and forth between the Simplified Ribbon and the classic ribbon in Office 365 click the downward pointing caret in the lower right corner of the full, Microsoft Office 365/2019 Outlook classic ribbon to collapse it to the Simplified Ribbon.
The Simplified Classic Ribbon displays frequently used commands in a single line.
For instance, if you don’t see a button that you require on the Simplified Outlook classic Ribbon, you will have many options.
To switch back and forth between the Simplified Ribbon and the classic ribbon in Office 365 click the downward pointing caret in the lower right corner of the full, Microsoft Office 365/2019 Outlook classic ribbon to collapse it to the Simplified Ribbon.
The Simplified Classic Ribbon displays frequently used commands in a single line.