How to tick deletion flag for all of the selected items one step with CEWB?

Dear Gurus,

I try to set the deletion flag for all routings with CEWB, and the working area I choose is "SAP_TASK(Focus: Header)"

but I don't know how can I tick all the deletion flag one time...I don't wanna tick it one by one

Any suggestion? Thanks in advance..!!

Jamie