Electronics anybody familiar with spice? What am I doing wrong here?

Hi - so I'm trying to simulate a circuit. I first set a DC sweep on the input (V3):

Then I hit the run button and choose node 6 (the output) when it prompts me, giving me this graph:

Then I try to change the horizontal axis bounds:

Which for some odd reason does not work:


What am I doing wrong? Thanks for your help!