How can I change the font size for Git Bash?
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Right click in the upper left corner of the Git Bash window and chose "Options..":
Click "Text" and "Select". Select an appropriate font size:
Press OK and Save to keep the new settings.
It's little different from a program like Microsoft Word, but the process is really simple**
Step 1: Open your Git Bash terminal and click your cursor on the logo present in the top left corner of the terminal prompt and then click on the link called Options... (which will be third from the last)
Step 2: Click on the button called Text (if you want to change the background, foreground, or cursor appearance, click on the first option called Looks), then under Font panel click on the button called Select. And from there you will have all options to play with your Bash font.
来源：https://stackoverflow.com/questions/43378290/git-bash-mingw-64-v2-12-2-how-do-i-change-the-font-size