Does a wife turning over during sexual intercourse and sleeping on her husband’s back, and enjoying that, diminish the husband’s chivalry and dignity, and is it considered imitating the actions of the people of Lot?

It is permissible for spouses to enjoy each other in any lawful way, except for anal intercourse or intercourse during menstruation. There is no evidence prohibiting the act mentioned in the question, and it does not resemble the actions of the people of Lot. However, if one fears that it may lead to an inclination towards their actions, then it is better to abstain from it. Furthermore, a woman being on top of a man may contradict natural disposition (fitra) and what the guardianship of a man entails, as mentioned by Ibn al-Qayyim.