Hello there, smcgarrah.
I'm here to lay out the steps on how you can get rid of the to-do list items in the QuickBooks Online (QBO) mobile app.
You can simply press and hold the To do list item and slide it to the left to remove it. See the screenshot below for your visual reference:
Additionally, you can check out this article in case you want to let your customer sign an estimate or invoice with your QBO app for a fast and secure transaction: Capture Signatures using the QuickBooks Online App.
You're always welcome to post a reply in this thread if you have any other questions about your QBO account. I'll be here, ready to assist you. Have a good one.