Three options:
He does not listen when you speak. What you are saying about your boundaries just does not register.
Or
He does hear you - and has decided what you are saying about your boundaries just does not matter.
Or
He does hear you and understand you - and has decided that he is going to control and infuriate you anyway, for fun, misogyny or sheer bloody mindedness.
Whatever his angle, he's manspreading. Bulldozing boundaries.
Email him saying 'I have repeatedly asked you to respect my personal space and not to use it for your possessions.
I see that once more you have ignored my request.
This is disrespectful behaviour and makes my work environment difficult.
In future, please use your own space for your own things.'
See what happens. Then if no behaviour improvement, bring the line manager in, to do their job.