Appearance
Spotlight Annotation
You can add a spotlight effect to the image through spotlight annotation to highlight the key parts of the image. 
Usage
Click the spotlight annotation icon to enter spotlight mode, then drag the mouse on the image to draw the spotlight. Release the left mouse button to complete the drawing.
Adjust Mask Opacity
You can adjust the opacity of the spotlight through the opacity slider on the toolbar. The lower the opacity, the more obvious the masking effect of the spotlight. You can also adjust the size of the spotlight with the mouse wheel.
PixPin