Late comment: You can cancel movements using the movement window if --a) for ships in national waters --> switch them to "MB" (mothball) or "RF" (reserve fleet); then open the movement window, select the ships, click "cancel movement order", DON'T CLICK OK!, instead click "cancel" to close the window --> moves are cancelled --> switch the ships back to "AF" (active force) --b) for ships in overseas waters --> switch them to "FS" (foreign stations) and proceed like above
Conclusion: this workaround sucks. The movement window doesn't work and never did. The same goes for the movement interfaces using the map regions.
dorn: Oh, thank you very much. I never knew about hotkeys. There is no list in the manual. Surely there are more hotkeys. I don't know the developers, but I am sure you do have contact. Please ask them: "Is it too unconvienient to include such a list into the game manual or promulgate a separate hotkey.pdf in one of the patches?"