Before making the first array component in a project. As with the first property, this is the moment to say what the feature is for: until one exists nothing in the editor hints that array sheets are there, and it is a feature a design can perfectly well never use. What the New array component dialog says before anything else: what it is about to make, and the far simpler thing most people wanting "an array" actually want. Said FIRST and on its own, because somebody who wanted the simple thing should be able to leave before reading a page about the advanced one. Pasting an array copies components and wires as they are; an array component is a sheet whose hardware is n copies of itself, which is more to learn and is only worth it when the copies have to join up.

Before duplicating a sheet. Duplication is usually the wrong tool: what people want is several instances of one sheet, which is what a custom component already is.

After a project written before ids were integers has been converted on the way in. Said once, when it happens, and never again for that project - the files are in the new form from then on. It is worth saying because every file of the project has just changed, which anyone keeping their work under version control is about to see.

Opening a folder that holds sheets but no `.dprj` marker. Issie can open it either way, so this offers to put the marker back rather than refusing the folder or writing to it uninvited.

Before adding a parameter to a sheet for the first time. The first parameter is the moment to explain what the feature is for, because until then nothing in the pane hints at it - and it is a feature a design can perfectly well never use.