This can be a tricky question because the will be a small amount of water left behind to keep the seals wet.
The water should not cover the bottom of the tub.
One thing you can do is to remove the filters and get into the sump of the dishwasher to check the drain impeller.
You can clean the filters and check the impeller for this problem.
The 675806 drain impeller can be obtained from the following link:
This dishwasher also has a "check valve" 675238 that might have failed. The check valve is located on the side of the pump with the drain hose hooked to it. It is suppose to prevent water from reentering the tub after the drain pump stops.
Thanks for the question and feel free to reply with any additional details or questions for further assistance.