Screens, placeholders, and shapes in a flow have blue connector points on their sides. They'll appear when you hover around them. To connect the screens, you can drag from one connector point to another.

You can also create connectors from individual layers or components on a screen. When you do this, even if you update the screen in the future and move the layer/component, the connector will automatically move with it.

You can delete a connector by selecting it and pressing the ⌫ / Del key.