What action should you take to ungroup sheets in Excel?

To ungroup sheets in Excel, the most effective action is to right-click the specific sheet tab, in this case, the Dec 18 tab, and select the Ungroup Sheets option. This method is direct and efficiently targets the group of sheets that are currently selected. Ungrouping sheets is crucial when changes need to be made to individual sheets without affecting the others that were grouped together.

When sheets are grouped in Excel, any action taken (like formatting or data entry) will apply to all the sheets within that group. Utilizing the right-click context menu allows for a quick and accessible approach to ungrouping. This aligns with Excel's functionality, where direct actions on sheet tabs typically provide the means to manage group settings effectively.

Other methods, like accessing commands from the Data tab or the View menu, may not be available or straightforward for ungrouping sheets, making the right-click option on the specific sheet tab the most recommended and commonly used approach.