Welcome aboard! I’m actually surprised that auto routing did this well our usual advise is don’t use auto router as it usually does poorly. Being as it did work reasonably well in this case, you can either ignore the advise about 45 degree corners (it only typically matters at rf type frequencies) or edit the sketch and drag the red dots to make another bend point at 45 degrees like this:
Click on the corner circled in red, then drag it in direction of the arrow til it is 45 degrees. I remember a key sequence that (cntr-shift?) that will snap to 45 degrees but that didn’t work for me in this case but a search in the forum search bar for something like “snap a pcb trace to 45 degrees” may turn up the correct advise.
Once you have done that, click on Routing->Design Rules Check (or DRC) to check the traces are all far enough apart. Good is
Where the red in the red circle indicates the overlap. Once DRC passes then you want to do File->Export for Production-> Extended Gerber, supply a directory (I usually use Gerber), and click OK. That writes the gerber files (which will be used to make you board) to the directory. You then want to examine them with a gerber viewer (I use gerbv from the geda project, but there are lots of others) to look at the traces as this (rather than the Fritzing pcb view) is what the board will look like. If you run in to problems post the .fzz file via the upload buttom (7th icon from the left in the reply menu) and one of us will have a look at it.