How to hide or remove strange objects on the design canvas

When I create a a Subprocess with BPMN with a start and an end event then I want to detail the subprocess on a lower level by double clicking on the subprocess. After thatThe the lower level is presented with some strange symbol attached to the start event (zie image, red circle)
image
I would like to remove or hide that strange symbol. Who knows how to do that?

kind regards

Rene

If the element you working on is a sub-process then the element being show is the detail view of the sub-process diagram. You can mouse over it and press the minus sign to hide out the preview.

image

Hi Rain, thank you very much for your answer. I have applied your suggestion and it works

kind regards

Rene