You can have completed tasks shown for a list by tapping the Show completed tasks button at the bottom of your list.
Could you please send me your diagnostic report from Todo?
You can email it to me by following the steps below:
-In Todo, tap on the settings button/Your Name
-Tap on "Information"
-Tap on "Diagnostics"
-Scroll down to the very bottom, and tap on "Email Diagnostic Report"
-Read the instructions of the popup message and tap on "Email"
-Please include the description of the problem you are having or the ticket ID of your support case
-When you are ready to email your Diagnostic Report, tap on "Send"