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There are two ways to position and scale the DashboardParts. The One possibility is to change the coordinates, width and height in the file directly (see above code). It is obvious, that x and y stands for the coordinates (in pixels, with (0,0) in the top-left corner of the editor-view). h describes the height of the DashboardPart, w the width (both also in pixels). The second way is to "steer" the DashboardParts: by selecting one in the Dashboard, it can be positioned and scaled with the arrow-keys:
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It is planned to position and resize with the mouse cursor.
Removing DashboardParts
To remove one DashboardPart from the Dashboard, the only possibility is to remove the corresponding line from the xml-file. A keybind is planned.