Visio Guy

I have received a VISIO file that has some "theme" applied to it.
Is it possible to remove or otherwise modify the theme?
It [the theme] appears to be the cause of problems w/ shapes I add to the drawing.

You can apply another theme and remove all unused themes after it !
File -> Info -> Inspect Diagram -> Reduce File Size

It could be as simple as:
select Design from the ribbon, then select No Theme from the themes drop-down.

Thanks Surrogate & Paul.
Over the weekend I did what I should have done to begin with, i.e. I found a Themes tutorial and read most of it. I suspect I'll be able to get rid of the themes as simply as Paul pointed out.