Version 2017.03 adds the ability to change the font size used in the Contact List. Previously, the font size was always 9 pt, which could be difficult to read.The font size can now be adjusted between 8 pt and 16 pt. The default font size has also been slightly increased, to 11 pt.
To change the font size, click the settings button in the upper-right corner of the Contact List and select the desired size from the "Font Size" sub-menu.
Here's how it looks with the default font size of 11 pt:
Here's how it looks after increasing the font size to the largest setting of 16 pt: