To remove screens from your flow, navigate to the Flows tab within the project and select the screens you'd like to remove. Then, right-click the selected screens to see the "Delete" option in the menu.
☝️ If you're on a version before Zeplin's Summer Breeze release, this option is called "Remove from flow."
💁♀️ You can select multiple screens at a time by clicking anywhere on the canvas and then dragging your mouse.