Choose the photo you want to hide then
Tap  icon on the bottom left
*If you can’t see this, just tap on the screen then it will appear

Tap “Hide”  on the bottom middle

The photo will be hidden from Moments, Collections and Years but still visible in Albums. This feature will create Hidden photo album and move the photos to there.
Tap “Hide Photo“

There is “Hidden” album create and one photo is inside.
You can Tap “Albums”  on the bottom right to see all your albums.
Let’s check the Hidden album

Well done!
There is the photo!