Hold icon for client list

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Hello, Years ago I added the Hold icon for the client list.- so I can put a case on hold by selecting the case on the client list then clicking the icon. I don't remember if it was located on the task bar or on the client list nevertheless, I can't seem to add it to my current account (premium) to save my life. I have contacted chat support, but they never seem to have any answers for me that I don't already know. 

I hope someone can shed some light!! Thank you!