What’s the data source? How is your app configured?
I created an app based on SharePoint list. And there is a Lookup column in my list. On the App, the Lookup column will be shown as a Dropdown box. I found that when adding a new record, I can see all the items when clicking the dropdown box. While when I editing the existing record, the value in the Lookup field cannot be changed.
Best regards, Mabel Mao
Community Support Team _ Mabel Mao If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.