The people at the Antergos Project came in with their hatchet and make changes to the implementation because why? Unclear. The most egregious of which is the use of lightdm. You are actually losing functionality. I don’t exactly know what was changed in their implementation. I listed what I can notice, but I am wondering what else was changed so I can revert all settings back to true defaults without going line-by-line through the settings.
I would say it would much easier for you to install Antergos Base system and do a
sudo pacman -S gnome gnome-extra
sudo systemctl enable gdm
and remove settings implemented from skel:
I know this answer is for WPS Office on an AskUbuntu site, but it might be relevant if you can find the file in the /bin/ directory and follow the directions using something like -style GTK+ because that’s what worked for me with the WPS suite of apps with each bin file. WPS is a qt app as well.