> ## Documentation Index
> Fetch the complete documentation index at: https://wb-21fd5541-workspaces-notebooks.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Run notebook cells

Run individual cells, all stale cells, or every cell in a notebook. Notebooks use a reactive execution model that determines execution order from variable dependencies rather than cell position.

## Run all stale cells

Run all [stale cells](./reactive-info#understand-stale-and-blocked-cells) without rerunning cells that already use the latest code and inputs.

<Tabs>
  <Tab title="UI">
    Select **Run all stale cells** (<Icon icon="circle-play" iconType="solid" />) in the lower-right corner of the notebook.
  </Tab>

  <Tab title="Keyboard shortcut">
    Press **Esc** to enter command mode, then press **Command+Shift+R** on macOS or **Control+Shift+R** on Windows or Linux.
  </Tab>
</Tabs>

## Rerun all cells

Rerun every cell in the notebook:

1. Press **Command+K** on macOS or **Control+K** on Windows or Linux to open the command palette.
2. Select **Re-run all cells**.

## Stop a running cell

<Tabs>
  <Tab title="UI">
    Select the **Stop** button (<Icon icon="circle-stop" iconType="solid" />) in the cell's toolbar to stop the running cell.
  </Tab>

  <Tab title="Keyboard shortcut">
    Press **Command+I** on macOS or **Control+I** on Windows or Linux to stop the running cell.
  </Tab>
</Tabs>

## Disable or enable a cell

Prevent a cell, and its dependencies, from running.

1. Press **Esc** to enter command mode.
2. Press **Command+P** on macOS or **Control+P** on Windows or Linux to open the command palette
3. From the dropdown menu, select **Disable execution**.

## Restart the notebook runtime

Restart a notebook's kernel to stop the current kernel and start a new one.

1. Select **action ( <Icon icon="bars" iconType="solid" /> )** in the upper-right corner of the notebook.
2. From the dropdown menu, select **Restart kernel**.

For more information, see [Disabling cells](https://docs.marimo.io/guides/reactivity/#disabling-cells).