It happened to answer for one of the PowerApps forums to display the dropdown of the word “All” with the Dataverse Choice (OptionSet) field.
When you use SharePoint as a Datasource it’s easy to combine with the word “All” and set the Items property of the dropdown. But when using Dataverse is different
Initially, I thought the solution will be similar to Sharepoint. But learned it’s not.
Solution: We need to loop through the Dataverse choice values like below
Since Choice won’t change frequently, Collect the values on Onvisible property of the screen and use it. In some scenarios, you may need to filter the choice field based on use cases.
To add the word “All” with the Dataverse choice field, we need to loop through the choice field to add to the collection. To improve the performance of the page load, you may use Concurrent.