Setting custom Admin theme from a Module
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Frontend templates are simple to change via Admin, from
default/mytheme. The Admin templates take a little more work, but it’s easy to do. This method was tested under Magento 22.214.171.124.
These steps apply within a Magento module. There are many tutorials on creating a basic module, so we will not repeat it here. All you need are the basic module directories, the module’s xml file under
/app/etc/modules, and a skeleton
config.xml for your module.
Create a directory for your theme
/app/design/adminhtml/default/mytheme and copy any templates, layouts, and locale you need. This works the same way as the frontend themes.
config.xml file, under the
<config> section, add this: