In Godot you may set your own fonts at whatever size is good for your screen and eyes.
In (upper right corner button) Settings / Editor Settings / Global there is a Font line where you set the path to the *.fnt font.
To create a *.fnt font that you could use in Godot, you have to use font's importer from Import menu first.
There you choose and set the font, it's size and other properties you need.
It's good to keep that font in folder other then current project's folder, so you could use it always in all projects.
After importing the font and knowing where it is, you select it in Settings / Editor Settings / Global.
Restart Godot. It should use your new fonts now.
It's worth to mention, that no matter of Global set font, a different font can be used for the editor alone.
That you can set in Settings / Editor Settings / Text Editor / Font line.