上記を見て、実施しようとしたが、Extensions アプリとやらの起動方法が分からず、結局以下のコマンドで対応した。。。
[hoge@rhel93 ~]$ gnome-extensions list
background-logo@fedorahosted.org
places-menu@gnome-shell-extensions.gcampax.github.com
user-theme@gnome-shell-extensions.gcampax.github.com
apps-menu@gnome-shell-extensions.gcampax.github.com
window-list@gnome-shell-extensions.gcampax.github.com
desktop-icons@gnome-shell-extensions.gcampax.github.com
launch-new-instance@gnome-shell-extensions.gcampax.github.com
[hoge@rhel93 ~]$ gnome-extensions info desktop-icons@gnome-shell-extensions.gcampax.github.com
desktop-icons@gnome-shell-extensions.gcampax.github.com
名前: Desktop Icons
説明: Provide desktop icons support for classic mode
パス: /usr/share/gnome-shell/extensions/desktop-icons@gnome-shell-extensions.gcampax.github.com
URL: https://gitlab.gnome.org/GNOME/gnome-shell-extensions
状態: INITIALIZED
[hoge@rhel93 ~]$ gnome-extensions enable desktop-icons@gnome-shell-extensions.gcampax.github.com
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