The way I found'till now is going to views > page > layouts > custom_index.php
Oh, sorry, I made a mistake. Well, if you want to add the modules, as far as I know, the functin used load each module is something like "elgg_view" instead of "elgg_view_layout", cause elgg_view_layout gets the whole module and layout.
DId you manage to do that? I'm having the same issue here.
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