You tested properly before going live, which was the right thing to do. Now your analytics are full of payments that never really happened.
The fix
Go to Mollie Payments, then the Analytics tab.
There is an option to reset your test data.
It clears the test transactions and leaves your live data completely untouched. It is safe, and you can do it at any point.
Do it once, at the right moment
The best time is the day you go live, before your first real customer.
That way your reporting starts from zero, your revenue figures are real, and your conversion rate is not being dragged around by twenty test payments you made yourself on a Tuesday afternoon.
Telling them apart
Test transactions are marked as such in your Transactions list, so you can always see which is which. Nothing is hidden from you, and nothing is deleted without you asking.