So why did you ask the same question in:
https://forum.kicad.info/t/saving-a-schematic-editor-after-editing-symbols/41055/3
Please do remember we are also volunteers and do not want to waste time and effort on answerering the same question from the same person twice. It also makes it more difficult for others reading this forum to find answers to their own questions.
Retiredfeline suggested to reduce the paper size, which would make schematic symbols bigger when the schematic is first opened. Did you manage to do that?