How do you mask on the new design tool

How do you mask on the new design tool – I can’t find anything that says “mask”?  I’m obviously missing something and need help.

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It’s this icon :two_hearts: On the top bar once you click on the two items. If you hover over the buttons it will give you their description. I wish it would just say them. :see_no_evil_monkey: I hate ‘mystery buttons’. 

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Thank you!   How would a normal mortal figure that out??

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