In Prism v10, you can use the automatic observation to acquire multiple images to do a mosaic. In Observatory menu, select "objects to observe list" then create a list of targets around your object to acquire the mosaic.
In this exemple, I am targetting the Veil nebula so I used the coordinates of a star between the two nebulae.
After having created my observation list (3x3 images around Veil nebula), I used the automatic observation tool to acquire all the images, 15 exposures for each section. Here are the screenshots for M31 and M45 mosaics:
I reduced each section (actually, in Prism, you just process everything and each section is preprocessed independantly) and export them as JPG images using the same visualization levels.
I tried Prism tool to assemble the images but it didn't work (alignment were not very good) so I used ICE (Image Composite Editor), a free Windows 10 tool to do panorama. It worked very well on the Veil nebulae, less on M31. Here is the result on the Veils - a nice picture with a very large field of view:
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