The following three choices are included in the last section, Start-Up Options: 

When you click the Default Programs button, a Set Associations for the Program dialogue box appears, allowing you to pick all of the kinds of program files you wish to have linked with Excel 2021. Once a file’s extension has been connected with Excel, double-clicking starts Excel 2021 for reading and editing. 

Tell me if Microsoft Excel Isn’t the Default Software for Viewing and  Editing Spreadsheets:  This check box determines whether or not you’ll be notified if your computer’s default spreadsheet program or viewer isn’t Microsoft Excel 2021. 

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