we have removed the paper now
When using patterned paper like the above its best used as a feature wall.
If you have a vertical pattern like this, it's ok,
https://www.litfad.com/plain-white-...-TbTyaaddrDYZI7yTI0fIu3Dg_L2NsmQaAgCaEALw_wcB
Or a pattern like this, it won't be too noticeable
https://www.homebase.co.uk/superfre...snDrnTMy0kmA7mPlSiQaArz8EALw_wcB&gclsrc=aw.ds
Geometric patterns or "busy" patterns (with trees and such like) it will always be noticeable.
I have in the past spent a substantial amount of time measuring the cut in the corner against the next sheet, and have successfully matched the pattern, it can be done, but my god it wastes a lot of paper in bodged cuts (took me 2x attempts previously) and it takes an extremely long time, I spent half a day trying to hang one sheet.
Really the decorator should have advised of the pitfalls before carrying out the work