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