You might want to do a little more thinking and experimentation here and a lot less complaining.
A reasonable person would read the 'width' section and think along the lines of:
- hmmm - looks like I can configure the width of the charts
- now where are the charts defined in Belchertown ?
- oh I see, in graphs.conf within the skin directory according to the QuickStart in the documentation
- there are a bunch of examples in the docs setting other parameters like colors etc.
- I wonder if width works the same way.....
- so perhaps I might try adding "width = 100%" to the definition of one chart (say - [[chartA]] in [homepage]) as one test to try to make it full width
- and wait the normal 5 minutes to let weewx regenerate the web pages
That person would be likely shocked to see it works. Positively shocked.