I'm using CC 2017 and noticed recently that the top bar in the spell check panel is very difficult to read. I have not changed anything but I may have recently updated InDesign. I tried changing the interface color but it looks the same for all. Hoping it's something simple, I'd appreciate any help.
I tested it on my copy of CC 2017 and the top field is indeed ghosted back more than the the Change To field (although mine was not quite as indistinct as yours—maybe it's the screen shot). It does appear that this may be either a bug or somebody's idea of subtlety.
Thank you. I reported it.