Silverstripe uses TinyMCE for its HTMLEditorField. By default, the editor is rendered relatively tall. But how do we change the height to make it smaller without having to alter Silverstripe core file? Silverstripe provides setRows() function to modify HTMLEditorField height. So you can make it smaller or bigger (if you think the default is not big enough). As usual, you can chain the function after ::create() like below: [crayon-676f7fc2a60a8328683314/]