Scratch-Out Opacity

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Hi, I'm a new (company in processing of buying) user of Balsamiq Mockups and very impressed with it.

One quick question though - how do you change the opacity of the Scratch-Out - i can find references and even screenshots of see through Scratch-Outs but I cannot see how to alter the value?

I am using v2.1.6 of Mockups for Desktop (still trial but soon to unlock as mentioned).

Many thanks

Ivor