Here is the forum thread about this issue: https://forums.adobe.com/message/10091784#10091784. — Taran Van Hemert
All tagged UI
JKdigital: How to Change UI Font Size in Premiere Pro
Adobe changed the font in the CC 2018 version of Premiere Pro and for some people the font size might me too small. But there’s an easy way to increase the size of the UI font. —JKdigital