While debugging in Visual Studio v16.3.2 I want to back on the previous breakpoint and I am trying to achieve it via Step Back Over
button. Why this button always disabled?
The reason could be that it's disabled in your IDE.
Try
Tools > Options > IntelliTrace > General
and in there make sure that “IntelliTrace events and snapshots” is checked.
This might or might not require a restart of the IDE.