The Find/Assert Widget action is better used for finding a certain widget and reuse the element returned. For asserting the value inside a drop-down or other input widget you must use the "Assert Value" action. You can enter the Widget Name and the value you expect. ATS will then check if that widget contains that value. I also added the link to the reference guide, as you see it supports a number of widgets.
I hope this helps!
Besides the option that Derryn provided you can also use the actions:
Hope this helps.
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