PyCharm - Change Font

Click File > Settings...

Within the window that pops up, click on Font and then click on the font dropdown(2). Select the font that you wish to use. Don't be surprised if it pops up with just one font to begin with, I had to to wait a while before more fonts eventually appear.

You can see that there is an option to change the size and line spacing easily. Unfortunately, I could not see a way to change the font weight, so I ended up using a "SemiBold" font to get around this.