Hello, @PR,
1) In order to make the mobile menu screen appear with a solid background color, we have created a video tutorial for you on our test site. Please watch and follow the steps shown in the video: https://www.veed.io/view/2c248fe5-a685-4da8-862b-291a1535c077?sharingWidget=true&panel=share
2) We regret to inform you that it is not possible to set the left or right off canvas as full width with the current version of the theme. Item support does not include services to modify or extend the item beyond the original features, style, and functionality described on the item page.
If you would like to pursue paid customization services, we recommend submitting a customization request to the WPKraken team via their website: https://wpkraken.io/?ref=8theme.
Alternatively, you can post your request on our Taskboard at https://www.8theme.com/taskboard/. If it receives enough votes from other customers, our development team will consider adding it in one of the upcoming updates.
Best Regards,
8Theme’s Team