Per Kimberly instruction I am creating a new ticket for my question.
•How to create a single column theme for MarketPress plugin with FrameMarket theme and GridMarket child theme?
Here is what I did per Kimberly's instructions?
I removed the following code <?php get_sidebar(); ?> from Page Template (page.php) located in the FrameMarket theme.
This instruction allowed removal of the sidebar from the theme but did not remove the sidebar from the MarketPress plugin pages such as Store page.
Also the content of the pages remain positioned to the right with a large empty space to the left where the sidebar was located.
•Other concerns how would these changes be affected by the next update for any of MarketPress plugin with FrameMarket theme and GridMarket child theme.
Your help is greatly appreciated!