After booting to Manjaro wanted to open the Settings app, but for some reason after clicking on the Settings app it just changes the cursor to a loading for few seconds and reverts back to the pointer cursor. (this also happens when I try to open the Printer app).
You simply put the name of the application in a terminal as a command then press enter. For example if steam was having issues launching you put steam then run the command.
Just booted up a Gnome ISO, command to run to open gnome settings is gnome-control-center
# gnome-control-center
gnome-control-center: error while loading shared libraries: libjavascriptcoregtk-4.0.so.18: cannot open shared object file: No such file or directory
Finally managed to fix it by searching on Firefox for hours and stumbled across the pkgs(dot)org site, searched the name of the library that throws the error and followed the how to instructions for the arch linux.
1. Enable the extra repository on /etc/pacman.conf:
[extra]
Include = /etc/pacman.d/mirrorlist
2. Install webkit2gtk zst package:
# pacman -Syu webkit2gtk