I’ll give 0 star if I can.

It is the worst app I have ever used on Mac. It’s unbelieveable that it was made by Amazon. Hard to use and every bit of tools inside the app will iritate you somehow. They could have made it better just by learning to Adobe Reader, but they didn’t. I also read on Kindle for iPad and Kindle paperwhite, which are both great, but the Kinle on Mac….. come on.
Just try to keep away from this app, or it will ruin your good mood every time you try to use it.

Jerry.Ye about Kindle Classic, v1.12.4