If you're looking for the Stroke options of a layer, you can find that by clicking the layer you have a stroke on or wish to have a stroke on, and then clicking the fx icon in the bottom of the layers panel:
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And it will open the Stroke options for that layer.
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Another option is by clicking Edit at the top menu, and then choosing "Stroke..." (make sure you have a layer selected).
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It will then bring up a window with Stroke options on it for that layer:
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I hope this helps! Let me know if you need further assistance!