In this article, we'll show you how to hide photos from Collections and Memories in the Photos app on iPhone. It also describes how to install and configure the Photo Vault app, which sets a password for accessing your photos.
Steps
Part 1 of 2: How to Hide Photos in Collections and Memories

Step 1. Launch the Photos app
Click on the multi-colored chamomile icon.

Step 2. Tap Albums
You will find this option in the lower right corner.
If a photo is open in the Photos app, double-tap Back in the upper left corner

Step 3. Tap an album
It should contain photos to hide.

Step 4. Tap Select
You will find this option in the upper left corner.

Step 5. Tap each photo you want to hide
Each photo will display a white check mark on a blue background in the lower right corner.

Step 6. Click Share
This option is marked with an arrow-shaped square icon in the lower-left corner.

Step 7. Tap Hide
It's on the bottom right.

Step 8. Click Hide X Photo
Instead of "X", you will see the number of selected photos. The selected photos will be hidden from the "Moments", "Years" and "Collections" albums.
To view hidden photos, click Hidden on the Albums page
Part 2 of 2: How to Use Photo Vault

Step 1. Launch the Photo Vault application
Click on the icon in the form of a folder with a key.
If you don't have this app on your device, install it

Step 2. Tap Start

Step 3. Tap Set Password
The onscreen keyboard opens.

Step 4. Enter your four-character password twice
Do this to confirm that the password was entered correctly.
You can also enter your email address in case your password needs to be reset

Step 5. Tap Next

Step 6. Click Agree

Step 7. Tap First Album
It's under "iTunes Album".

Step 8. Click +
You will find this icon in the lower right corner.

Step 9. Tap Photo Library
You will find this option in the center of the screen.

Step 10. Click OK
Photo Vault will access your photos.

Step 11. Tap an album
If you don't know which album to choose, tap All Photos at the top of the screen.

Step 12. Tap each photo you want to hide
A white check mark appears on the thumbnail of each photo.

Step 13. Tap Done
You will find this option in the upper right corner. The selected photos will be transferred to the Photo Vault.

Step 14. Click Remove or Cancel
If you click Remove, the selected photos will be removed from the albums, and if you click Cancel, they will remain in the albums and will also be copied to the Photo Vault.

Step 15. Close Photo Vault
When you launch this application again, enter the password to access the photos.