Override all existing pages with panels

One major problem with using panels for all pages is
that many modules doesn't have built in integration
for panels. A solution to this problem is to write an
integration for the module to get the full control but
this sure needs some time. So Swentel wrote a
module which allows to take over any existing page, yes any!

Page manager existing pages

To use it start on admin > structure > pages
and "add an existing page". Let's put the Panels configuration page into a panel, so input something into the search paths, see image.

Once you have done this go back to admin > structure > pages,
there you see "pm_existing_pages-{name you choosed above}"; enable it
and configure the panel.

One important pane you should know is under "existing page" -> "existing page":

That's all, see