01-09-2023, 09:22 PM
Not 100% sure about your workflow but it reads like you have your background layer (the lighthouse) as the image size, the canvas and have the portrait (with transparency) on top of that.
You can move that top layer around and move it off the canvas and parts vanish. To see all use View -> Show All
To increase the canvas size to hold all the layers use Image -> Fit Canvas to Layers and if you want, turn off Show all.
You will be left with an image with blank areas where the new image size is larger than the original layer sizes.
30 second example: https://i.imgur.com/FHY2mfr.mp4
Up to you what to do now, maybe use the crop tool or put a new coloured layer at the bottom ...
You can move that top layer around and move it off the canvas and parts vanish. To see all use View -> Show All
To increase the canvas size to hold all the layers use Image -> Fit Canvas to Layers and if you want, turn off Show all.
You will be left with an image with blank areas where the new image size is larger than the original layer sizes.
30 second example: https://i.imgur.com/FHY2mfr.mp4
Up to you what to do now, maybe use the crop tool or put a new coloured layer at the bottom ...