The Forward and Back buttons at the top left in the main toolbar work just like in a web browser. They invoke the Go Forward and Go Back commands.
The Go Back command (Alt+,) jumps to the previous location in the selection history. The Go Forward command (Alt+.) jumps to the next location in the selection history. The selection history list is circular, so if you reach the end of the list, the Go Forward and Go Back commands will wrap around to the other end of the list.
The Go Back and Jump To Definition commands make it easy to travel down a function call chain, and "pop" back up the chain, and then travel down another path with a different function call.