HyperWorks - Edit Contact Surface Elements

I'm part-way through completing the "HyperWorks for PreProcessing 2022.2" training (newbie!)

I'm currently at the "SetUp, Validate & Run > Model Build and Setup Workflow" (Exercise 5B).

I'm currently struggling to delete a few specific/unwanted elements from the "Contact Sets" but am struggling to do so.

Any help would be appreciated. Thanks