Base on a ligtweight environment

Runtimes aren’t desktop environments, and they don’t contain a desktop interface. They are a generic base for app developers. At the moment, there are 3 kinds of runtimes: * Freedesktop, * GNOME (based on Freedesktop with GTK tools) * KDE (based on Freedesktop with QT tools) AFAIK, Collabora Office requires QtWebEngine to render UI; therefore, they use KDE runtimes. You can use other Office Suites, such as LibreOffice, OnlyOffice, WPS Office, Abiword, Calligra, or Google Notes, or similar web offices.