Thanks for contacting us and choosing our product!
It seems you changed Wrong settings in Theme Options -> WordPress Settings -> Page Settings and it make page default have sidebar.
We returned default settings for you and it’s working fine now.
About your question change Tags widget you need go to Posts -> Tags or Products -> Tags
To change widgets (delete tags) on the sidebar you need to go to Appearance -> Widgets.
Here is the document of theme: https://document.harutheme.com/pricom/
Hope this helps!