Is this possible? I have looked through the help and tried lots of the example code but the top bar is always visible.
This is not possible with the SDL version of SmallBASIC. But you can use the console version in combination with raylib. See the example “Window Flags”: SmallBASIC | plugins_raylib
I found this. I could add this as a start up flag.
In SDL2 the window border can be set even after window creation. I guess in SDL3 it will also work. Maybe an additional sub-command for window() like setBorder(true|false) would be great.
Oh fantastic 
Bit confused about SDL vs raylib. Just starting to study 