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!