Hi there! To make the change permanent you have to then go to your SSRS Server then on the path where SSRS is installed you have to do some modifications on the js file called ReportingServices.js. By default in SQL Server 2012 it will be inC:\Program Files\Microsoft SQL Server\MSRS11.MSSQLSERVER\Reporting Services\ReportManager\js
Open the file, you will notice it will be a minified js. Go to the bottom part then copy and paste the following js code.