The picture didn't load but I guess you're referring to the 'On sale in x days' or 'Due in x days' banners that can appear on the cover images to remind you of an event. To turn those banners off, go into the Preferences/Style and check the option 'Don't show status banners over cover images'.
The on sale on x days, means the DVD release date is coming up in so many days. It lets you know that you will be able to buy that DVD soon as it will go on sale to the general public.
The banners are based on the 'Release Date' field, which is imported at the time of searching the databases like Amazon etc. along with the rest of the movie information.
If the release date were to change very late in the movie schedule, you'd have to delete the date from the release field and then gather the information from Amazon again.
We do not have a list of your movies - all the data is local on your computer.