This is a problem that all programs have, but it is really annoying and inconvenient to rename project files. You have to close Libre Writer, open the file manager, right click “rename file,” rename it, and then right click “open with… → Libre Writer”
It would be nice to go File → Rename File → you rename it and click ‘Apply’ → and then the project refreshes with a new file name. Of course, there would also be an option to choose the directory where this file is to be stored.
Thank you! : )