Order "Entries Fields" by entry order
It's order('sortOrder') instead of fixedOrder(true).

{% set entries = craft.entries({
    relatedTo: { sourceElement: entry, field: 'entriesFieldHandle' },
    order: 'sortOrder',
    limit: null
}) %}


If you don't make any further modifications to the params (i.e. reverse order, other limit) there's also the short syntax for the above that Jamie already suggested:

{% set entries = entry. entriesFieldHandle %}