sachinsehdev It's from a RC version of T4 Builder, if you want to try, you can backup these 2 files:
/media/t4pagebuilder/builder/js/editor-config.js
/media/t4pagebuilder/builder/js/plugin-t4.min.js
Then download attached zip file >> unzip and copy 2 JS files inside to replace above files:
You will see more layouts like this: