I have been using yEd for a long time, I consider it a good product for my simple needs
Unfortunately, I always thought yEd had a small Achilles' heel: the flowchart navigation.
I would consider it easier to edit a flowchart if you used zoom and motion management as in several graphics software:
!) the movement of the wheel of the mause which leads to moving the sheet up and down;
2) the same movement, associated with pressing the left Ctrl key, which leads to a Zoom-In zoom-out;
3) always the movement of the wheel by simultaneously pressing the left shift key to move the sheet to the right or left.