@analysisrate : The layout option is not available in the free version of the theme. You will need to upgrade to the Pro version of the theme where you can select 4 Columns layout. To know more about the features available in the Pro version of the theme please follow the link below.
https://catchthemes.com/themes/catch-everest-pro/#compare
Let me know if you have any questions.
Regards,
Tikaram