Somehow you have to get each field in your app into a column in the data source. You've got to map that relationship. An alternative to a gnarly Patch() is: OnStart of the app, OnVisible of the screen or OnSelect of an item in a gallery, create a collection of the record(s) ...
So, we can easily set the default value to people picker control in PowerApps Forms, and we can update the person or group field using the Patch function. You just must generate the object with the specific format which includes Claims, Email, Department, DisplayName, JobTitle, and Picture ...
add-field-form.md add-move-configure-or-delete-components-on-form.md add-move-or-delete-fields-on-form.md add-move-or-delete-sections-on-form.md add-move-or-delete-tabs-on-form.md add-reporting-to-app.md additional-controls-for-dynamics-365-for-phones-and-tablets.md advanced...