• Have you checked if problem occurs with fish 2.3.1?
• Tried fish without third-party customizations (check sh -c 'env HOME=$(mktemp -d) fish')?

fish version installed (fish --version):
fish, version 2.3.1-541-gf9115b5

OS/terminal used:
iTerm

The colour for partial match in completion suggestion is whitish and I found no way to customise it. This is fine for dark themes in terminal. But if I use light themes in my terminal (e.g. iTerm), such as "Light Background" or "Solarized Light", the characters become un-readable. Check attached screenshots.

Dark Theme:

Light Theme:

Any workaround for improving the readability in light themes?