Using TextChanged Event can accomplish your goal.
Suppose we have two Entries (or more) and we set the name for it. For Entry, we could handle TextChanged event for it,
<Entry x:Name="entry1"/>
<Entry x:Name="entry2" TextChanged="entry2_TextChanged"/>
We can set focus to any Entry we want by implementing the TextChanged event handler. The following example shows how to focus entry1 when entry2 is empty.
private void entry2_TextChanged(object sender, Microsoft.Maui.Controls.TextChangedEventArgs e)
{
var entry = sender as Entry;
if (entry.Text.Length == 0)
{
entry1.Focus();
}
}
Please let me know if you have any question.