Photoshop always opens documents at a zoom level especially chosen so you can see everything.
- You can choose the Zoom Tool, then use the [ 100% ] button in the Options Bar.
- Or with the Zoom Tool selected or the Spacebar held down, you can right-click on the image and choose 100%.
- Or the Control 1 keyboard shortcut will cause Photoshop to display your image at 100% actual size.
-Noel