Looks like two parts are needed - the first is to tab and the second is to verify the element in focus. There are a couple of posts that tell you how to do each step:
Part 1: tab without providing a test object, using Robot: Clicking tab once the page loads through katalon command - #11 by hemant.mishra.extern
Part 2: verify that your expected focus is correct: Focus verification - #3 by kazurayam
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