Nozbe app: deleting items without context

I have many items without context. If fact, most of them have not context. On my Nozbe app I cannot delete them. I can only ‘tick’ them, but they stay forever ‘ticked’.

Other item that do have a context, I can hit the Edit buton and delete them quickly.

Anyone a tip for me how to delete my items quickly without context (on the app!)