Optional open state in Uint8Array[0]. Write only 0 (closed)
or 1 (open); the close button writes 0. Null omits the close button.
The native call accesses this writable backing memory directly.
Returns
void
Remarks
create Metrics/Debugger window.
display Dear ImGui internals: windows, draw commands, various internal state,
etc.
Show the metrics and debugger window.