Yes — a UK Will can deal with a property you own in Europe. Under the EU Succession Regulation, known as Brussels IV, a British national can elect in their Will for the law of their nationality to govern their whole estate, including a home in France, Spain or Italy. Participating EU states apply that choice, and Brexit did not change it.
That election is what disapplies local forced heirship — the rules that otherwise reserve a fixed share of a property for children, whatever your Will says. But it only works if it is made expressly, names the correct UK legal system, and is consistent with any local Will, marriage regime or ownership structure. A Will that never made the election leaves the default in place.
A separate local Will is not always necessary, and two uncoordinated Wills can accidentally revoke each other. Tax is a separate question from succession: local inheritance tax may still apply, alongside UK Inheritance Tax depending on domicile.
If you own property abroad, a Legacy Protection Assessment will confirm whether your Will actually does what you think it does.