Started a new job two months ago. Things are not working well. Would like to apply for a new job. How to make sure current manager won’t find out?

Like the title says, I started a new job out of college two months ago. Things are not working well, and I am thinking about applying for a new job. How do I make sure my manager won’t find out? Also my dumb ass added my manager and a company recruiter on LinkedIn so if I connect with somebody they would be able to see it. Any suggestions? Thanks in advance!

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