Hi @Reolfi
and welcome back, great to see you again here!
Thanks for sharing your valuable feedback on the HubSpot Community!
For a volume this large, I’d recommend using the import tool (as @TeeTech mentioned) or API-based batch updates.
That said, I completely understand how this would be beneficial to have in the UI, so, like @karstenkoehler suggested adding your upvote and comment on this existing idea " Fix Formatting Issues Bulk Fix " would be great!
Thanks and have a lovely day!
Bérangère