To customize the optimization mode, go to your WP dashboard and click Image Optimizer on the left side menu. Then click Advanced. 

You’ll see a bunch of settings you can tweak to get just the optimization tool you want. For example, you can choose to keep or discard the EXIF data (date and time, camera model, lens type, etc.) or the original of the image, to set different modes of compression for different image formats. 

In the same way you can choose to convert certain formats of images to others to make your site faster by clicking the Conversion tab and enabling it.  

The Other tab will let you customize your images further. You can set to exclude images of a certain size and weight, optimize anew if the mode has been changed, etc.