On the ribbon.
The three basic components of the ribbon in a software interface are tabs, groups, and commands. Tabs categorize related functions, groups organize commands within each tab, and commands are the specific actions or tools available to the user within the software program.
tabs, groups, and commands
If you have buttons on a tab, it could be called a group of buttons. It you have multiple tabs with buttons, you have a group of tabs.
Ribbon.
Ribbon.
You have tabs on the ribbon and groups within the tabs.
Ribbon
The Ribbon.
ribbon
This question is not clear. Please ask again with more specific words to indicate what you want to know. Do you want to organize worksheet tabs by month, do you want to sort a list of dates by month, do you want to separate a list of dates into groups sorted by month, or something else.
Tabs, buttons, and groups