If you want to have more space in your workbook you can hide the Ribbon menu by pressing CTRL + F1.
Another way is to click on the ^ icon which is located on the far right hand side of the Ribbon menu.
Helpful Resource:
John Michaloudis is a former accountant and finance analyst at General Electric, a Microsoft MVP since 2020, an Amazon #1 bestselling author of 4 Microsoft Excel books and teacher of Microsoft Excel & Office over at his flagship Academy Online Course.
