Change the filter category order in Expression

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WordPress by default doesn’t provide an order option to the categories. One way to set a custom order to your filter categories of the gallery page would be to order them by their slug. To do this you have to modify line 19 of the includes/gallery-load.php file:

$args=array("hide_empty"=>false, "hierarchical"=>true);

to be like this:

$args=array("hide_empty"=>false, "hierarchical"=>true, 'orderby'=>'slug');

with this modification your categories will be ordered by slug, so by editing their slug you can change the order. One option would be to append a number like this:

1-photography
2-landscapes
3-portraits