How do I get more level space for player?

Im creating a platform game similar to super mario , thing is the layout ends after very limited space and moving further layout player falls out of screen.

Im using 720p landscape project

how to get lot of unending or maximum x-axis platform space i mean how to get more x-axis platform space in one layout itself ??

In the layout editor, click on a blank area. This will show the properties, then change the "layout size" to what you need.

Thanks it worked ! Helped.