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Double-clicking on a repository object will enable views for that object: Master, Design, Links and Instances depending on the object type.
The Master View holds the information about Object Settings and Object Attributes which can be edited in-line.
The Design View allows the possibility of adjusting the layout and UI behaviour of the repository object by adding other controls to it and configuring events on them. To add a new control to the object simply click the Add button on the top-left toolbar of the layout designer which will open a dialog form that allows you to search and select a specific other existing object or control and then just drag-and-drop it against an "empty" or used node on the right-hand side of the layout hierarchy view.
The Links View enables you to perform bindings of controls in order to display data content into a grid or into a form from a business entity data source object, or even to link several business entity objects between each other so that children entity data is automatically displayed for the current parent record.
Any changes to the object settings, attributes, design , layout and events or links need to be saved before they will take effect.
The results of these changes can be checked easily in the same fashion the layout designer was launched, this time specifying the name of the repository object you would like to view in action.
CTRL+ALT+SHIFT+L within the https://proselcon.akiomacloud.de/ workspace and filling in "layoutdesignerw" in the popup screen that appears.