In the current version of MyHome, property ID is generated automatically by WordPress
e.g. property below have ID: 113
WordPress ID is also 113
It is not possible to customize it because it is fully related to WordPress.
The only option to make it more flexible is to create new new number field (/wp-admin/ >> MyHome Panel ) and add it to single property manually.
Additionally you can hide default id on the property page:
via this CSS:
.mh-estate__estate-info > ul > li:first-child { display: none!important; }