Hi David. So If I got it right, the only thing you missed in your microflow is the Commit Action with ‘Refresh in client’ checked with yes .
I’ll write below how would my process of doing this look like.
I would create a Person Entity in Data Model, and generate overview pages (right click action on your Entity in domain model) (Image1+Image2) . When you generate your pages you’ll always get The overview page and the one with the suffix _NewEdit. (Image3) You can open that _NewEdit page → go to the properties and make it responsive, since you want to add datagrid and we want to have a clear overview of the things on the page. We wouldn’t have that if it was a popup page. After that, you’ll edit the ‘on click action’ on your save button on _NewEdit Page and choose an option ‘Call a microflow’. Then, you’ll create a new microflow with the name ‘ACT_EntityName_CreateNew’ because you want your app to be organized and by the Mendix conventions (Image4). There you’ll add a change object activity and after that Commit activity. (Image5) .
Hope it helped.