Game Masters can hide parts of a tree from players, which is handy when a bloodline holds a spoiler. There are a few layers of control.

Secret trees

Setting a tree's Secret? toggle to "Yes" hides the entire tree from players — they won't see it on the main screen, in search, or by direct link.

Secret leaves

Marking an individual leaf Secret? hides more than just that one person. It also hides everyone descending from that leaf (children, grandchildren, and so on) and any partner attached directly to that hidden line. The hidden line stops there, so a partner's own separate branch stays visible. This keeps you from accidentally revealing a secret parentage through the people below it.

Automatic hiding

A leaf linked to a character that's marked secret in your Codex is hidden from players automatically — you don't have to remember to also flag the leaf. Likewise, a signpost node that points to a secret tree is hidden from players.

What GMs see

Game Masters always see the full tree. Any card that's hidden from players shows a small secret-eye badge, and hovering it tells you why it's hidden (the leaf is secret, its character is secret, it descends from a secret leaf, it's partnered onto a secret line, or it links to a secret tree). Search also respects all of this, so a player can never surface a hidden person by searching for them.