In order to remove Favorite, you need to follow the below steps:

Step1: Delete Favorite page so the Favorites no longer appear in User Dashboard:

Step2: Remove Heart icon from property Unit.

Use the below custom CSS:

.icon-fav-off,
.icon-fav-on {
display: none;
}

Step3:  Remove the add to favorites from Property Page

Use the below custom CSS:

#add_favorites {
display: none;
}

Help article about how to add custom CSS