Widget config on blog post pages

Hi, I'm using Triden. I'm configuring widgets.

I've configured widgets into the homepage, which is set in the theme options as 'custom homepage', in the top-left & top-right positions, and these widgets only appear on the custom homepage.

When I configure a widget as 'sidebar', it appears on the blog entry page only.

First, is this expected behaviour? Second, if so, then how can I get a widget to appear on both the homepage and the blog page?

If I've already configured e.g. blogs, in the top-right position, then it is deemed used, and therefore can't be placed in sidebar. However, because sidebar is not on the same page, I'd like to be able to do this.

Am I missing something? Or if not, is there a workaround?