To eliminate the border, start with the center panel. Single tap it to select and drag it to line up with the top or bottom border of the background, Then stretch it at one corner to line up with the left panel, and stretch it again at the other corner to line it up with right ...
Question How do I resize a layer without resizing the entire image? Community Answer In the 'Layer' panel, choose the layer you want to resize. After that, go to 'Edit' and click 'Free Transform'. Resize the layer as you please then. ...