how can I clear the "Unmatched Transaction List"
Try these steps
Step-by-Step Clearing Process
Alternative: Accept All At Once. If you have verified that all listed transactions are accurate and do not need to be matched to manual entries, click the "Accept All" button. This instantly moves the entire list into your register as cleared transactions and empties the unmatched list.
So how do I edit this unmatched transaction list. I want to delete all the "unmatched" since everything I have is matched.
I am having this same issue. Before there was NEVER a problem with Quicken finding and matching to the correct register entry. Now having to check it each time is very time consuming. I end up going into the register and deleting the incorrectly entered item made by Quicken. Now I did notice today the the incorrect extra item has a blue pencil item instead of the usual red and when I hovered the mouse over the blue pencil it was referencing the correct already entered item!! and most of the time when I delete the blue pencil item it will match to the correct item!
There isn't a way to clear the whole list. This has been asked for, for a long time, but has never been implemented.
The one thing that is different it was a long time ago is that they have put in a limit to how far back it will look. I think it is something like 30 or maybe 60 days. So, eventually it should clear up provided that you do things properly.
The way the unmatched list normally accumulates is because the user deletes transactions on in the Downloaded Transactions list, instead matching them. And it doesn't help that Quicken doesn't really use the date in the way people think it should for matching. If you multiple unmatched transactions in the given time period that have the same amount, Quicken is going to select the oldest one even if the transaction's posting date is clearly closer to a more recent one.
There is the ability to delete the unmatched transactions although it's not very obvious. When the new transaction come in DO NOT accept them. Select just one, do a right click and select "Manually Match Transaction"; the unmatched transactions will show and then you can select the ones you want to delete and then click "Delete"
You can only do this on transaction that are in the downloaded transaction tab. Once they are accepted then you can get to the list. I had stumbled on this last year and just could not think of it but the neurons finally connected.