1. Add photo
Click "Add photo" to bring up the file chooser dialog.
2. Select photo
Left-click to select the photo (1). Then, click "Open". Alternatively, you can also double-click the photo.
3. Optimize photo
Click "Auto optimize".
Optimization only takes a few seconds. Use the slider to switch between the before / after view. Click "Save" to apply the new settings. Repeat these steps to auto-optimize additional photos.