You can make buttons which run
Set LISTERSIZE=... to do that.
Set LISTERSIZE=1000,700 would set the height to 1000 pixels and make the width 700 pixels.
Set LISTERSIZE=*,500 would keep the height as-is and make the width 500 pixels.
You could also use layouts, but the commands are probably better/easier if you just want some buttons to resize the current window.