aka, type "fish" and press up arrow to only go through history that starts with "fish"
also, how would you configure fish to use something that doesn't lean on arrows? ^r has its own useful power that can be separate from my use-case of arrows mentioned above, if not just bc you don't have to move off the homerow ;)
It lacks "ctrl+r" because it does history search even better than bash. It shows auto-suggestions based on your history. I find ctrl+r when I'm in bash kind of annoying, and not as good at searching.
And to clarify, I understand Fish has autocomplete as good or better than bash but not having the keyboard shortcut as ctrl-r is what's making it hard to get accustomed to since I jump around servers where only bash is available and have to use ctrl-r extensively.