yaml configurator should open in bigger configuration by default

[ChristophCaina]

when you edit your dashboard, the configuration panel does open in a specific size by default:

When you switch to the yaml mode, it keeps this size - which will make it sometimes really hard to edit - or at least see your complete yaml configuration:

With clicking on the title, the editor will be resized:

This is nice - but it might be an idea to switch the size directly, when you switch to the Code editor...?