If you want to delete all of your Picasa photos from your Note 4, here’s how:
- Open the Photos app on your Note 4.
- Tap the three lines in the top left corner of the screen.
- Select Albums.
- Tap any album to view its contents.
- Tap any photo to view its details (if it has any).
- Tap the trash can icon next to the photo you want to delete.
- Select Delete Photo from the pop-up menu that appears (or press and hold on the photo until a menu appears with Delete Photo at the top). ..