Hello Sir,
A.) You can change it from default pages listing files.
check:
https://prnt.sc/1q1lnt6
File Path:
1. ajax load more files: wp-content\themes\archcode\dz-inc\ajax
2. normal pagination files: wp-content\themes\archcode\dz-inc\elements
B.) You can change it from the portfolio edit page.
https://prnt.sc/1q1mu7u
Thanks
Please enable elementor page builder for custom post type.
check: https://prnt.sc/1s5derd