Layers
Layers are the drawing structure of a plan: what kind of thing each object is. They go out in an MVR export, and an MVR import brings the layers of the file.
A new scene starts with three layers: Rig, Fixtures and Scenery. Rename them, delete them, add your own; they are a starting point. An MVR import replaces them with the layers of the file, so somebody else's plan arrives organised the way they drew it.
One layer is the working layer. Click a layer's name to choose it; it is highlighted. Everything you create lands on it: fixtures, truss, set pieces, and whatever you paste or duplicate. Choosing a layer does not select what is on it and does not move anything.
In Plan, only the working layer can be selected. Clicks, selection boxes, Select all and Invert only take objects on it. Everything on other visible layers stays drawn but cannot be picked up by accident, so a click in front of the truss you are editing goes through the fixture to the truss. To take one object from another layer without switching, Alt+Ctrl+Click it (Alt+Cmd+Click on a Mac). Selecting from the side panel lists, a group or Select all of this type is not limited, because those name what you want explicitly.
Move things to another layer from the right-click menu in Plan: Layer › and the destination. It moves the whole selection in one step, and Undo puts it back. The current layer is ticked. Moving objects onto a hidden layer hides them at once.
Add a layer with + Add layer; it becomes the working layer. Names must be filled in and must differ from the others. Rename by double-clicking the name.
A layer can only be deleted when it is empty. Hover the × to see why it is greyed out: "Layer cannot be deleted because it contains 14 objects." Nothing is ever deleted or moved on your behalf. The last layer cannot be deleted either, since new objects need somewhere to go. Empty layers are shown faded rather than hidden; they are still part of how the file is organised.
The eye hides a layer, for you alone. Hiding is not an edit: it is not saved, not in the undo history, and does not change what anybody you work or share with sees. A hidden fixture also gives no light, which makes hiding a fixture layer a quick way to see the set without it. Show all appears while anything is hidden.