Change fisher installation path. Place it in $fish_config/conf.d/fisher.fish

fisher.fish

set -g fisher_path $HOME/.config/fisher_install

set fish_function_path $fish_function_path[1] $fisher_path/functions $fish_function_path[2..-1]
set fish_complete_path $fish_complete_path[1] $fisher_path/completions $fish_complete_path[2..-1]

for file in $fisher_path/conf.d/*.fish
    builtin source $file 2> /dev/null
end