There are terminal and python console in pycharm, which are very convenient. But I found that the font size was too small to recognize in terminal or python console. How can
A simple google search would have lead you here.
You just need to create a personal scheme under settings >Editor > color and fonts.
Edit:Here this further explanation may help more.
1.In color and fonts choose save as and give a scheme name.
2.Go to console font and change size and primary font, which will be inaccessible if you didn't choose the personal scheme you created earlier.