I am using a 4k Windows laptop and I configured the compatibily settings for PyCharm(2017.2.3 Community Edition) and the font size of the editor looks fine.
Subsequently,I wanted to fix the font size of the terminal and the python console. Using this post and this from stackoverflow, I went to File -> Settings -> Editor -> Colors Scheme -> Console Font and I changed the font size. This resulted in changing the font size of only the python console and not the terminal. Any suggestion?