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25mm ply is heavy to start with, especially across 2300mm. I used 18mm across about 1200mm and didn't trust it without a central support (so at 600 in from either end). I looked at the sagulator mentioned and probably overbuilt it from there.
The depth of the shelf and what it'll have on it make a difference as well - if it's one paperback deep you might be alright but if it's e.g. vinyl LP depth it might struggle without some intermediate supports which come out to nearly the front edge.
si_mon628
We have a big recess between two fireplaces, like 2300mm wide, that I’d like to fill with bookshelves. Would 25mm plywood sag if I used aluminium supports on each end and a few along the back length? https://www.wickes.co.uk/Alcove-Shelf-Bracket-Black-190mm/p/249884