Hide left sidebar and top header bar for use in iframe for example or some other scenarios.
Add hide-sidebars after ? as query parameter to nextcloud url or with dir parameter after &.
If you need to hide only left or top menu you can use hide-left-menu or hide-top-menu.
Examples:
http://nextcloud.example.com/index.php/apps/files/?hide-sidebars
http://nextcloud.example.com/index.php/apps/files/?dir=/New%20folder&hide-sidebars
This app from version 2.0.0 brings new config parameter addAllowedFrameAncestorDomain to allow embedding into a website.
Simply add the following line to your config/config.php:
...
'addAllowedFrameAncestorDomain' => '*.example.com:*'
...