# Inside an activity: the header, the tabs and Home > What each part of an activity's screen does, and how to undo a change. Open an activity by selecting its title on **My activities**, on the dashboard, or under **Recently used** in the menu. ## The header On the left: the list button back to **My activities**, the activity's folder, its title and its state. The state is **Draft** (never published), **Live** with its version number, or **Unpublished changes** (students have an older version than the one you are editing). On the right: - **Preview**, **Publish** and **Share**. See the guides under **Sharing with students**. - **Undo** and **Redo**. - **Theme**, to choose the look of this activity. - **Readiness**, with a number when something would stop the next Publish. Open it to see the list. - The three-dot menu: **Title and description**, **Save as a template**, **Export as a file**, **Take down…** (only while it is live) and **Delete…**. ## The tabs - **Activity home** (the house) is a summary: four tiles (**Students**, **Finished**, **Average score**, **To fix**), **Pick up where you left off** with the pages you edited last, **Still to do** with **Things to fix** and the steps of **Getting it live**, and **How students are doing**. - **Activity** is where you build the pages. - **Interactions** edits the interactions on those pages. - **Review** lists each student who finished the activity, with what Taktyl scored. Open one to see their answers and give a mark out of 100 and feedback. They see it on their **My work** once you press **Release marks**. Work that reached your LMS is marked in your LMS, so it opens read only here. - **Insights** shows how students did. - **Settings** holds the title, the description and how the activity runs. ## Undo and redo **Undo** (Ctrl+Z) and **Redo** (Ctrl+Y, or Ctrl+Shift+Z) work on the changes you make to the activity's pages: moving a page, deleting a content page, taking an interaction page out, switching the cover or finish screen on or off, and the **In this activity** settings of a page. Hover over **Undo** to see which change it will take back. While you are typing in a box, Ctrl+Z undoes your typing instead. When you delete something, a message also appears with its own **Undo** button.