Thanks Joe for responding.
A.
I was expecting exactly that such as soft click in left mouse button would open up attributes. But in my case, it results in zooming in. Is there an alternative way?
Soft click (left mouse button) does nothing. Double click (left mouse button) results in zooming.
B.
Mouse wheel control also helps me to zoom in and out. So, that feature works correctly.
C.
Does this have anything to do with the choice of browser? In my case, I am using Firefox.