In the town of:
You can see the problem when too many pictures are placed side-by-side.... then the screen stretches out and you have to slide the cursor over to see the whole of this sentence.
I put a single space (with the space bar) between the first two photos above, and dropped the third one down by putting "Enter" after the second picture. Then I centred the whole lot.
(On a narrow screen, the centering will be strange if your wide collage has stretched the page.)