With almost no help from anywhere, I finally found the problem.
For those who are also facing similar issues, please note that pages designed with Beaver Builder will not be displayed using Beaver Themer Singular Template. For that, the pages has to be designed either with Block or Classic Editor.
But if you wish to design pages in Beaver Builder, then those pages will display using the themes in-built singular template and not the Beaver Themer singular template.
This can be a problem if the theme you are using has limited options to control the layouts.
But in my case, I am using GeneratePress Premium, so I have complete control over each and every aspect of the theme and the layout.
Hope the information was useful.