Microsoft Office suite apps (programs) Word, Excel, PowerPoint, Outlook, Access and more; all have Options Settings. The options in any of these apps contols the behaviour and appearance (in each).
To fully understand what changing these options means, it not only effects the changes in the current workbook, document, presentation etc it implements these changes in all (workbooks, documents, presentations etc.) from this point on. For these settings to take effect you will need to close the app (program) and open it.
This is all well and good, however, if you change an option setting in Excel for instance by removing the marker in the check box to Not Show row and column headers it will affect your current and all future workbooks.
There are useful options settings that are possible time savers, they are found under the General setting, such as:
The default Font, Font Size, perhaps even the Office background and Office theme. At the end of the day the choices are yours based on your preferences.