Multiple images can be stitched together to create a wider and taller scene, referred to as a panorama. A basic requirement is that the series of images overlap horizontally or vertically.
The benefits of creating a panorama are:
You can create multiple panoramas simultaneously from your image collection. Each detected panorama is stitched and previewed, before you create your panorama(s) by preview selection. A new document is created per panorama.
Individual Images
Final Panorama

You may need to fine-tune your panorama using masking and transforming techniques (see Editing panoramas) before removing unwanted transparent regions using cropping or inpainting.
Alternatively to steps 1 through to 4, you can share two or more images from your library in Apple's Photos app to Affinity Photo’s New Panorama dialog. The first time you do this, tap More at the far right of the Share sheet's available actions, turn on the switch next to Stitch Panorama and tap Done to make this action available for use. Tap the action and follow from step 5 above.
Do one of the following: