Both Novoking and Hipihi don’t have resizable windows that you can maximize and have them fill the screen minus the taskbar area. (Like the browser you are reading this in does.)
In both Hipiihi and Novoking you can make it full screen or not, when not, it doesn’t fill the screen, and doesn’t fill the screen minus the taskbar.
So with both programs, you can accidentally hit the area outside of the virtual world’s window, like some annoying add on the browser, or accidentally hit the close window X on the program behind the virtual world window.
These two programs are the only programs I use that have this flaw.
In my decades of computer use I have never once wanted a program to work like these programs do regarding the size of the program window.