Please follow the next steps in order to setup resizing and cropping correctly:
- Go to Global Settings plugin page -> "Settings"/"Cover"/"Lightbox" tabs.
- Select "Thumbnail (150*150)" in "Image Size"/"Cover Image Size" options. If you need to set another size, please select "Custom" and type the necessary values in the fields below.
- Make sure you have "Crop Images"/"Crop Cover Images"/"Crop Lightbox Images" options marked. Then select the necessary position in the "Crop position" option.
- Save changes.
- Click "Update images" button on the plugin settings page, and wait for all images to get updated.
WordPress will create a copy of the thumbnail with the specified dimensions when you upload a new image.
Please note that "Crop images" option is available only in the Pro version and only images of custom size can be cropped.