Hello,
Sorry, but I do not see the problem – http://prntscr.com/t6tx0q Appearance > Widgets > Shop sidebar > http://prntscr.com/t6tvwf About the sidebar on Single product page, provide temporary wp-admin access, we will take a closer look. Theme Options > Show footer demo blocks > off, https://www.8theme.com/demo/docs/legenda/Widgets_and_Static_Blocks/Widgets_and_Custom_Widget_Areas
Regards
