Dynamics CRM Power Apps Web Portal Form and Its Subgrid did not show in the web browser

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I am preparing a Power Apps web portal. But when I am adding a Form on my page and testing on browser, subgrid is not showing.

Preview on Web browser image which does not show Subgrid:

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This is my developing screen where I'm adding a Web Form:

enter image description here

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Arun Vinoth-Precog Tech - MVP On

Because the form in Insert mode, try changing it to Edit mode to see the subgrid. You cannot add child records in subgrid unless parent entity record is saved/created/inserted, that is the reason.

When creating a new entity form, the first step is to decide the Entity and Form Name that you will be rendering, in addition to the mode: Insert, Edit, or Read Only. The mode selected will determine if you are creating a new record from the portal, editing an existing record, or just displaying information about a record on the portal.

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