With the increase in the screen resolution, the font size of the formula bar in Excel looks smaller.

But now, you can change the default font for the formula bar.
- Go to File > Options
- Go to the General tab
- Change the Font Size



Or, you can find the same option in another tab
- Go to File > Options
- Go to the Accessibility tab
- Change the Font Size (for instance 16)



When you change the value in one of these options, the value will be updated in the other option.
Then, you must restart Excel



And when you restart your workbook, the font of your formula bar is bigger


