Install the Beta for Better Privacy in the Photo Gallery
If you want a little more privacy on your Galaxy S8 or Galaxy S8+, the Android 8.0 Oreo beta is definitely worth a look.
The current version of the Android 8.0 Oreo beta allows you to hide albums in the photo gallery. The Private Mode feature already lets you do this, but this simplifies the process.
If you're running Android Oreo and you want to hide a specific gallery, select the Hide albums button from the gallery menu which is accessed via the three dots in the upper right hand corner of the display
From there, you can select which galleries you would like to hide from the front page.