_AdminLayout.cshtml file inside of the Shared directory within each Plato theme allows you to optionally customise the administrator dashboard layout. It's unlikely you would need to modify this file unless you wanted to customise the Plato dashboard.
TIP If you do decide to modify the
_AdminLayout.cshtmlfile we would suggest leaving the Plato version number in place within the footer area of the layout file. It's helpful to display the version number somewhere easily accessible within your Plato installation so we can assist if you or someone else needs to contact support in the future.