Until we automatically zoom in on the last point you edited upon opening a Flow (which we will!) those of us who Author big Flows can feel a bit lost.  It's perfectly natural.

But thanks to "Search" there is a handy little trick: when I am quitting an authoring session, I add an Instruction point right where I am and I label it "Resume".  Then when I come back next time, I search for Resume and bang!  Right back in.  I delete it and carry on.  It can be useful to do the same thing with a point called "End".  For any other Point, using good Labels should ensure you can hop right to wherever you need to be.

Happy Authoring!  Grow the Flow!