@Dirk Gesink, I want to add to what @Haydn Zeis expressed. 

But talking to the tenant face to face, giving her the benefit of the doubt, and expressing your sincere desire to appropriately deal with any problem will go a lot further than starting with an adversarial stance. 

In fact, I have a property that has a similar door on the back of the house and, even though the tenant didn't have an issue with it when they first rented the house, they did later express concern about the safety/security of the door due to the large glass panel and the ease with which it could be broken into. 

Contact the police each time and practice your innocent and surprised facial expressions, in the event the neighbors complain to you that the cops were called

An easement may be both implied or express. 

Several people have expressed shock/surprise when they meet me there and asked if I owned the house, at first I was honest but now sometimes I tell them my parents own it.

The tenant expressed interest in it, so I left it as the gift.I have also given a small plant on occasion.I always leave a greeting card.

The tenant had taped over the unit to prevent mold exposure to herself and baby, and expressed her concern to the handyman to please use extreme caution when removing the unit, she even gave him garbage bags to bag it, because didn't want mold in the air.  

It also helps them save face and gives them an opening to express their thoughts on the matter.

When I was looking for a place near DT, I have confirmed all situations by simply expressing my interest to live nearby and asking about graffiti and where gangs hang out.