The more info link on all graphs really doesn’t provide more info, it just makes the graph bigger. Whe an entity changes state for a brief moment, there is no way to see what that state is. I have tried using the companion app, a cursor on a desktop, but home assistant will only show the state on either side of the brief change of state.
Related to WTH can't I zoom in or out on history graphs
Closing as a duplicate. Please vote and follow the link above.