Goodness, that is a high res screen! But still usable at 200% (I'm assuming)
I hesitate to suggest too much with you using a Mac. You could use the page below to find the presets under a prevcious vcersion and copy them across, but it would almost certainly be quicker to reinstall Photoshop.
I'll edit your subject to show that you are using a Mac, which will attract people with relevant experience.
I'll give it a try. Photoshop CC 2018 keeps stock curves presets in the Applications/Photoshop CC 2018/Presets/Curves folder
Custom Presets are kept in the User Library folder under Application Support/Adobe Stock presets do not belong there.
If you not have them, uninstall and reinstall.
Thanks, I was looking for them in the wrong presets folder. The old versions folder had what I was looking for so I just manually copied them to the new version without having to reinstall. Still unsure how they were just MIA, so weird. Thanks again!