A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
On Mac, this can be caused by Full Keyboard Access intercepting the Spacebar in Excel.
Try this:
- Open the Apple menu.
- Go to System Preferences.
- Select Accessibility > Keyboard > Navigation.
- Turn off Full Keyboard Access.
- Return to Excel and test typing in a cell again.
If the goal is to insert a new line inside the same cell, use Control+Option+Return.
References: