Change menu colors layout

[Hanzel]

Gnome manjaro uses the package gnome-shell-maia (that is the green accent)
replacing this with gnome-shell will use the default blue.

gdm uses the manjaro-gdm-branding package to style the login screen in the green accent color.

Source:

How to remove default Manjaro GDM theme?

Currently, the only way to theme GDM is by compiling GNOME Shell with custom colors–that’s what we did with gnome-shell-maia. manjaro-gdm-branding is just that–the Manjaro branding. We used to have manjaro-gdm-theme that changed the color. Replace gnome-shell-maia with the regular gnome-shell package: sudo pacman -Syu gnome-shell Also change the Accent Color in the Custom Accent Colors GNOME Shell Extension preferences. You will need to log off or reboot for the change to take affect.