Install eog-plugin-hide-titlebar by entering the following commands in the terminal:
sudo apt update sudo apt install eog-plugin-hide-titlebar
Description:
Hide Titlebarplugin for GNOME Image Viewer
eog-plugins contain a set of plugins for eog, the GNOME Image Viewer. . This plugin hides the titlebar when GNOME Image Viewer is maximized.
Homepage: https://wiki.gnome.org/Apps/EyeOfGnome/Plugins
Version: 3.26.2-1
Section: universe/gnome