Q&A plugin customization issue

To customize my q&a I copied all necesairy filles to the root of my theme where the css file is. But i'm still struggeling with it's apperance.

I wanted to have the questions displayed in the layout that looks like this

so I thatught to customize it i need to add my template aetup into plugin templates. And so I copied page template part into plugin, and the header displays properly as well as footer (watch add question page, this is the one i was experimenting with for now) but i still have some issues with sidebar

here's the link to that page

I also attached screenshoots of edit-questions.php and page.php – the template of my default page.

What can I make it work?