Categories and Archives in side bar

if you don’t have any widgets in the widget areas under appearance – widgets, then a theme often shows hard-coded sections in the sidebar;
https://codex.www.ads-software.com/WordPress_Widgets

to totally remove these (sidebar) areas from a site, you will need to edit some theme files;
to get relevant suggestions for your theme, please ask at https://www.ads-software.com/support/theme/poloray/

Cheers, I was guessing as much but, was hoping for a quick fix.

Thanks for replying though.