@taniak, kindly please be informed that as a KoboToolbox user, you can collect data for KoboToolbox using two different approaches. The first one is using the KoboCollect Android App, and the second one is using the web form aka Enketo.
i. Data Collection on KoboCollect App (Latest Version)
ii. Collecting Data through Web Forms
If you are collecting data through the webform aka Enketo, then please be informed that a queued submission that has been finalized for submissions cannot be deleted from the browser. This is the submission queue as seen in the browser:
But if you are collecting data through the Collect Android App you should be able to delete the draft submission as you have outlined in your screenshot:
I hope I was able to differentiate the difference between the two.
