Copy and Paste Headers v3.42.0

I've been off work for 1.5 years. I am now working with this version of ReadyAPI. In the older version, I used you could select headers and then ctrl-c to copy them, go to another test step, and Import HTTP Headers from the clipboard button and they would paste into the new test step.

With this version, I cannot select the headers. I used to use ctrl and shift/mouseclick to select them. Now it seems you cannot select them.

Does anyone know how to copy headers so that I can paste them using the Import HTTP Headers from the clipboard button?