Hi bertsirkin,
1. Open file "\CuteSoft_Client\Gallery\Viewer\LightBox\Code.js"
2. Find section below
var th=Math.floor(toolbarheight*tstep/10);
this.toolbar.style.height=th+"px";
this.frame.style.height=h+th+"px";
3. Change it to
var th=Math.floor(toolbarheight*tstep/10);
this.toolbar.style.height="300px";
this.frame.style.height=h+300+"px";
4. You can change to the value you need.
Regards,
ken