In Impress 5.4.6 if a shape partly sticks out of the slide (in edition mode), during the presentation it is moved so it is wholly visible. So I had to reinstall the last version that doesn’t do that (5.3.7.2). Will it be fixed in the future versions?
I’m not sure if it is a bug or it is supposed to be a feature:-)
[EDIT] The report has been filed.