How to hide the formatting toolbar for an html variable on catalog item?

[Avinash_Patil1]

How to hide the formatting toolbar for an html variable on catalog item?

expected output is 

[LeonLalaev]

The following code works for me 😏 (Yokohama patch2-hotfix2)

function onLoad() {
   var sheet = top.window.document.styleSheets[0];
   sheet.insertRule('.tox-editor-header { display: none !important; }', sheet.cssRules.length);
}