Thanks to the valuable answers of @Paul2009 in this platform, we managed to understand how to break lines at gallery titles, grid titles and product titles (i.e. the product title in the 'shop' page).
We tried to apply the same methods to break the lines on summary block titles, but unfortunately never managed to do so.
Would there be a solution for this particular situation?
Here is the link of the concerned page: https://www.thelabfragrances.com/earl-grey
As seen there; we have the following structure:
Earl Grey 30ml Perfume
Whereas we would like to have:
Earl Grey 30ml
Thank you very much.