A lot of people seem to be fervently recommending LibreOffice, but is everyone using windows and/or in light mode? Because dark mode support is horrible, and changing settings inside the App doesnt do anything, you need to force themes via commandline from the outside if you want any of the symbols/icons to be legible. Im just using they default integrated Plasma 5.27 dark mode, not even a custom theme or anything. So trying to use LO has been nothing but a hassle, I would even accept having to use light mode permanently in LO, but that isnt even an Option as the setting does nothing. Sorry for the rant but I just has to mention my experience as its been so bizarre.