Here's a great resource on cookie troubleshooting, with many principles applicable beyond oatmeal cookies: https://www.quakeroats.com/cooking-and-recipes/baking-101/cookies/common-cookie-issues/spread-in-oven ;o)
Might I suggest you check out https://food52.com/blog/18820-why-cookies-spread-how-to-stop-it-with-tests-videos as a way to figure out the reason your cookies are spreading more than you want. You can identify the culprit most likely responsible for your particular case, and then work to address that. Although it's usually a case of too warm dough, there are other causes.
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https://food52.com/blog/18820-why-cookies-spread-how-to-stop-it-with-tests-videos
as a way to figure out the reason your cookies are spreading more than you want. You can identify the culprit most likely responsible for your particular case, and then work to address that. Although it's usually a case of too warm dough, there are other causes.