Hi, I had posted a tread on NSCDE's github itself here: https://github.com/NsCDE/NsCDE/issues/90
The team there gave me the solution for this problem ;
1) install gtk3-nocsd from debian repos
2) add in .bashrc :
export GTK_CSD=0
export LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libgtk3-nocsd.so.0
So my question : could this be automated by NsCDE desktop install ?
Nice to maintain this nice Desktop!