Front module: create or view composition

The latest version of the studio (V13.4) has improved UI in frontend module where I see one filed with pulldown option of composite entities. The transactions I have created in my generic UI can be displayed here, looks nice. I suppose the beta2 of the front module is here!

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Now how can I have the composite entities view in a table like sales_order_line here with a Create/Edit/Remove buttons, any help will be appreciated.

The sample app is attached in case of needtestfrontproj.zip (2.2 MB) .