TheseStars

Hi thesestars,
Welcome to Affinity Forums
This happens when you crop the image but don't rasterise the layer after the crop (to get rid of the hidden cropped data). Affinity Photo Crop Tool is non-destructive - it keeps the cropped data hidden in the layer.  When you enlarge the canvas you are adding space around all the edges - including around the area you have cropped and that's not visible - that's why you don't see the added space around spme edges. To fix this, right-click the layer/image in the Layers panel and select Rasterise (it will discard the hidden cropped data) then enlarge the canvas to add the border as you are doing. It will add space around all the edges as you'd expect.
 
The blue line you see around the image is its bounding box and means the layer is currently selected. The crosses over that line means the layer is locked (it has a padlock icon in front of the layer in the Layers panel - click on it to unlock the layer if you want. It's bigger than the canvas because it still includes the hidden data you cropped from the original image (so it represents the size of the original un-cropped image. After you rasterise the layer as I described above it's size will match the size of the cropped image (because you got rid of the hidden data).
 
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NOTE: thread moved to the Questions section.