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How to mirror hole?

Newbie here!
I have a hole that I wish to "mirror", but I cannot select the hole to mirror. It looks like the hole has been merged into the main "part" so I can only mirror the part, not the hole.
Can anyone explain what I am doing wrong? (It's a simple shape so I can easily replicate the hole, but I am keen to understand more, for more complicated builds!). Here's the link, the hole is obvous, and I want it mirrored to the other side of the main part:
https://cad.onshape.com/documents/993c1b88b1e294865d8a1511/w/54ab408e55c5a70bceaf3002/e/7540d5f006505e335709c195
Any help much appreciated, thank you! 😀
Comments
Common problem. Change "Part mirror" to "Feature mirror."
I know this fact, but it still catches me out sometimes and leaves me head scratching before I remember it again!
I think it would be great if those options in those types of tools were not hidden in a drop down. It would aid in the tool discovery process for new users as well.
I've been using OnShape for 9 months now and always had to use sketch or create extra parts to boolean them and just recently saw a video where a hole was mirrored in Fusion 360 and was like "I wish OnShape could do that"
I never even noticed that dropdown menu there…
Thank you!