Obsidian 1.0 has an option to use the native titlebar, under Settings > Appearance > Advanced > Window frame style: "Native frame".
Earlier versions of Obsidian did not have an option for this; CSS tweaks or plugins were required to hide the standard titlebar, and KDE window rules could be used to force the native one to be used in its place.
Used for the dark variant of the default theme in Obsidian 1.0.
Used for the light variant of the default theme in Obsidian 1.0.
