Remove Table of Contents web part maximum limit

We use the "Table of contents" web part on SharePoint landing pages to give access to users to easily navigate to the sites/pages. But, there is a default limitation on the display items in left navigation or table of web part contents in sharepoint. By default it shows only 50. If you have more than 50 items [either sub sites or pages] in a site then it will not show up. To increase the limit or to remove limit, please do below changes.