How do I plan the key moments of a romance in my novel?

From version 1.9.22, open the Codex from the book's page and choose Relations. Open the romantic relationship with the arrow at the end of its row. When the tie is a romance, a section called "Their moments" appears. Press "Add a moment", choose or type the moment (the first meeting, the first kiss, the break-up, and so on) and the chapter where it happens. Press Save. Each chapter is then written knowing which moment belongs in it, so the romance builds at the pace you chose instead of rushing.