Answered
My tools bar is overlapping my vertical ruler, how do I fix this?
The title says it all. Here's a screenshot of the problem (see the left side of the window):

The title says it all. Here's a screenshot of the problem (see the left side of the window):

Of course I found the solution 20 seconds after posting this. D'oh!
I fixed this by dragging my tools bar to the left side of the screen, which caused a blue line to appear. When I let go it snapped into place and the ruler / canvas area moved over to the right of the tool bar. Example:
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