expose-group-by-app not work on 10.15.4

[amikai]

This line are not work for me.
My osx version 10.15.4.
https://github.com/mathiasbynens/dotfiles/blob/master/.macos#L393

Search group in preference com.apple.dock:

$ defaults read com.apple.dock | grep group
"expose-group-apps" = 0;

Therefore, Use followed command which is work on my macbook:

defaults write com.apple.dock expose-group-apps -bool false