1. In the SharePoint list, add a choice column and enable "Allow you to add choices".
2. The default SharePoint form allows users to add new choices later, in addition to the pre-registered choices.
3. When customizing a form with PowerApps, users cannot add new choices from the PowerApps combo box control.
We hope the Power Apps custom form a combo box Control to behave like SharePoint so users can add new choices！😊✨
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