/*******************************************************************
  * @NApiVersion 2.x
  * @NScriptType ClientScript
  * @NModuleScope SameAccount
  *
  * Author: Sciuridae54696d
  * Date: 31-01-2021
  * ******************************************************************* */
 define(['N/record'], function(record) {
	var module = {};

	module.pageInit = function(scriptContext) {
		 var currRec = scriptContext.currentRecord;
     console.log("running");
     jQuery('#uir-record-status').hide();
	 };



	return module;
 });

Trying to do some DOM, to hide that standard NS blue box on approval on invoice, any tips?

You are trying to use an

#id

selector, it should be a

.class

selector.

jQuery('.uir-record-status').hide();