> ## Knowledge Base Index > Fetch the complete knowledge base index at: https://documentation.celestory.io/sitemap.xml > Use this file to discover available pages before exploring further. > Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash). # The Project History # 🕰️ The Project History `Cmd/Ctrl + Shift + H` opens the **History** window. It's your safety net for recent mistakes: a clickable log of what you just did in the project, with the ability to jump back several actions at once. 🔺 History **is not** a separate mechanism from `Cmd/Ctrl + Z`. It's the same action stack, displayed as a list: Undo/Redo moves one step at a time with each key press, while the History window lets you click directly on the step you want and jump several steps in a single click. --- ## 🧩 What one entry covers One entry corresponds to **one action** taken in the project: adding, moving, or deleting a block, editing a dialogue, creating a connection, renaming a variable, changing a label, and so on. The coverage is broad: it isn't limited to the graph, it also tracks variables, labels, menus, translations and project settings. Some grouped actions count as **a single entry**. For example, deleting a selection that contains several blocks, groups and connections at the same time only creates one line in the history: restoring it undoes the whole batch at once, not block by block. Each line shows the time the action took place and the type of action performed. --- ## ⏱️ When a new entry appears An entry is created **immediately after every reversible action** — not on a regular interval, and not when you save (`Cmd/Ctrl + S`). Saving your project does not clear the history: you can still undo actions made before a save, as long as the project window stays open. --- ## ↩️ Restoring an earlier version In the window, past actions are listed with a switch turned on; actions that have already been undone (if you went back) appear below, greyed out, with the switch turned off. Click a line to: - jump straight to the state right before that action, if it's part of the past; - or redo forward up to that action, if it's part of the future (the actions you already undid). No need to press `Cmd/Ctrl + Z` once per step: a single click jumps directly to the right point. --- ## ⚠️ What you lose when you restore Going back does not delete anything by default: as long as you make **no new change**, the undone actions stay available in the lower part of the window and can be redone at any time. 🔺 However, the moment you make **a new action** after going back, every action that had been undone is **permanently lost**, with no confirmation and no way to get it back afterwards. 🔺 History only lives in your current working session: it is not sent to or kept on the server. Closing the project clears the list entirely. It is therefore not a long-term versioning system: it covers your recent actions in the current session, not the project's full history since its creation. --- → Next step: if you're looking for the exact spot to fix your mistake, head to Search a Block.