When I am finished editing my project and want to use it I need to save it as a plain SVG.  It seems that no matter what I do when I save as a plain SVG the page border returns when I reopen it.  Making the opacity 0% would work for me but the opacity returns to 100% when I reopen it.

Thanks

The page border does not show online in the forum but does on my computer in Inkscape.

When you open a drawing, inkscape displays a page border by default until you say otherwise. This adds to the code....

     showborder="false"

However, this is an Inkscape-specific instruction, not recognised by other applications, so it's discarded when you save as plain svg.

So Inkscape will always display a page border in any svg that was not saved as an Inkscape svg?  And that is a property of the Inkscape program and not the file, so the Inkscape page border will not show up if the file is opened in any other program?

Exactly. Inkscape's page border is not part of the svg file. It's a drawing aid so you can see the boundaries of your image as you work. You can draw outside the border but these shapes won't be displayed (will be cropped) in a web browser, for example.