Don’t worry, if you did accidentally flag something it takes several flags for something to be hidden or draw mod attention. What you saw was probably the pop-up to flag something, which would still require you to pick a reason and submit it. If you clicked anywhere off of it it just goes away with no effect. I bring this up several times a day scrolling on my phone. If you want to see what it looks like, feel free to click the button to flag this post and you can see what it looks like before dismissing it again. If you want to learn more about how the BBS works or have more questions, check out this thread:
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