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The template location behaviour described in the README for the {% flat_menu %}
tag (https://github.com/rkhleics/wagtailmenus#4-using-the–flat_menu–tag) was only introduced in version 2.2.0
. You should be able to use your custom template by utilising the template
argument, though. For example:
In header.html
{% load menu_tags %}
...
{% flat_menu 'top_sub_menu' template="menus/top_sub_menu.html" %}
...
Source:stackexchange.com