The contextual help overlay temporarily highlights areas in the project window that offer direct access to relevant documentation. It is available in all modes.
You can show the contextual help overlay in any of the following ways:
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Press F1 (Windows) or Cmd-/ (macOS).
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In the toolbar, click Show Help
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Choose .
When the contextual help overlay is shown, help buttons with question mark symbols are displayed centered in each highlighted area. Clicking help buttons 
opens relevant documentation in a web browser.
The contextual help overlay closes automatically after several seconds of inactivity or when you click a help button.
Help buttons are also available in selected dialogs.
You can navigate through the contextual help overlay using the following key commands:
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To select the next help button, press Tab.
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To open the selected help button, press Return.
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To close the contextual help overlay, press Esc.