How do I find the hidden album on my iPhone 15 Pro Max?

Have you looked in the Utilities section of the Albums tab? You may need to scroll the view all the way up to see the Utilities after you open the Albums tab. Do not tap "Show more" in Albums, or you will only see your own albums.

You will have to unlock the Hidden album using Face ID, Touch ID, or your passcode.

By default it will be locked.

To change the default setting from locked to unlocked, go to Settings  > Photos, then turn off Use Face ID, Use Touch ID, or Use Passcode.

The hidden album only appears after you hide a photo

Catopper Said:

"Hidden album: After I followed all the steps, I looked into my iPhone 15 Pro Max for the hidden album but I couldn't find it."

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Unhiding Albums:

1. Go Here: If you're Missing Photos or Videos in the Photos app - Apple Support
2. Scroll to: Unhide your photos
3. Proceed from there as necessary.