It can be lightly pruned to help it bush out, but it is described in many places as a small upright tree, so I wouldn't expect it to bush out much.

This is the link to the RHS information: https://www.rhs.org.uk/plants/85116/amelanchier-x-grandiflora-ballerina/details

A beautifull shrub but as Eileen says, you have chosen an upright variety and a light prune on a regular basis will help slightly. Amelanchier lamarckii (canadensis) would have been the best choice.

Yes A. Lamarckii is definitely more bushy.

Thank you all. That’s what I suspected but didn’t know Ballerina wasn’t bushy like other trees when I bought it. I planted it to hide a neighbouring house wall at the back of the garden. Oh well, it’s very pretty but I shall have to rely on my lovely Sambucus nearby to do the job now.

Thanks again.

I too have the Amelenchier , but planted it so that it would fit in the border.

Thanks for all your comments. When I looking for Amelanchier I found it difficult so when I spotted one in a nursery I didn’t hesitate. Of course I didn’t know that it would be the skinny model. Oh well, it’s still pretty.