If you are talking about removing the two images on the right side of the slider and showing full width of slider, then you can go to Appearance > Customize > Widgets and select the TG: Product Slider widget. After that, move the selected widget from Front Page: Slider Area to Front Page Sidebar.
In hot products, we could not find any second image. So, can you clarify the issue with a screenshot if possible?
In Posts, you can assign the featured image to show the image in the post by going to the respective post in the dashboard and setting the featured image and update to show.