flwm.tcz & flwm_topside.tcz >> src code
https://www.google.com/search?q=flwm_topside+srcI've reviewed the FLWM source code!
but i'm not a programmer!
If the change values are zero -0-
It is obvious that a FLWM without title bar will appear

but visual function keys are important
* the vertical title bar is unreasonable,

maybe, chinese can read well

* the bed header bar is unnecessary,

it is already clear what the application is

and it also fills the screen unnecessarily!
Is it possible to make a simple development on this topic?
a new alternative proposal may be more efficient.
proposal ; frame without title bar
my suggestions; in the window; when the middle mouse button is pressed
Classic visual window frame options arrive!