Since updating to LR Classic (7.0.1) the info overlay disappears as I move between modules (Library and Develop typically) and sometimes even when I move between collections and folders. To get the overlay back, I go to the View Menu > View Options > uncheck the box beside "Show info overlay", and then check the box again. There is a delay with the spinning circle and then the overlay appears again.
Using Lightroom Classic 7.0.1 on iMac with mac OS High Sierra (10.13.1).