I have a form "frmIDEntry" where the AssignedTo field defaults to a value "---" in the Power App. After the record is submitted, the default value does not save and display in the gallery. Do I need to perform other functions to save the default value?

As a side note, I do not want the initial User (entering a record) to change the AssignedTo default value. Can this be accomplished by making the Card Visible value = false yet save the default value)?