We were recently developing a PowerAPP where we need to prefill the default Selected value.
I was surprised to know even if you have default value selected in SharePoint list column, in PowerAPP it will come as blank.
SharePoint List column:
PowerAPP form Shows as below:
We want when user fills the form default value should be prefilled as in screenshot:
To do above you have to edit the data card in PowerAPPS à go to Advanced and in DefaultSelecteditems
ADD below formula as per default value from the SharePoint choice list you want to have. (Save and Republish)
If(
SharePointForm1.Mode = FormMode.New,
{
Value: “Add Members”
},
Parent.Default
)
Voila! When user now opens the form, he will see prefilled selection in the form.
Thanks for reading….
Tech Wizard
Tech Wizard 
Great, the {Value: “Add Members”} helped me greatly! I used it differently though by using the {Value:DataCardValue.Text} to auto assign my form to whatever project I was already working on! Thanks for a short but sweet post!