$schemamarkup = get_post_meta(get_the_ID(), 'schemamarkup', true); if(!empty($schemamarkup)) { echo $schemamarkup; }

How to Install Gnome Tweaks on Debian Gnu/Linux Distro

Gnome Tweaks Install Debian

How to Install GNOME Tweaks (formerly GNOME Tweak Tool) on Debian GNU/Linux Distribution – Step by step Tutorial.

And Gnome Tweaks for Debian is a Graphical interface for advanced GNOME 3+ Settings.

How to Install GNOME Tweaks on Debian GNU/Linux - Featured

Debian GNOME Tweaks Installation Guides