The user interface is very simple to use and I am able to edit multiple files at once. There are many different tabs that you can open in one window so you can have all of your documents open for editing without having to go back and forth between them. Sometimes when I save a file, the next time I open it, it will not be saved correctly and I have to close and reopen it. This happens with multiple files as well. I would like to see an option to change the font size of the text, but this is not available. I have been using this software for several years now and it has never caused any problems or issues during my usage. I love the fact that I can easily edit multiple files at once without having to switch windows or tabs.