There isn't a single shortcut specifically for "auto fit" in InDesign. However, you can achieve the same result using a combination of shortcuts depending on what you want to achieve:
Auto-fitting text within a frame:
- Option + Shift + T (Mac) or Alt + Shift + T (Windows): This shortcut fits the text to the width of the frame while maintaining the original font size.
- Option + Shift + C (Mac) or Alt + Shift + C (Windows): This shortcut fits the text to the width of the frame while adjusting the font size to fit.
Auto-fitting an image within a frame:
- Option + Shift + F (Mac) or Alt + Shift + F (Windows): This shortcut fits the image to the frame, either filling the entire frame or maintaining the original image proportions.
Auto-fitting a table within a frame:
- Option + Shift + T (Mac) or Alt + Shift + T (Windows): This shortcut fits the table to the width of the frame while maintaining the original column widths.
- Option + Shift + C (Mac) or Alt + Shift + C (Windows): This shortcut fits the table to the width of the frame while adjusting the column widths to fit.
Remember, these shortcuts offer flexibility in how you want to adjust the content to fit the frame. Experiment with them to find the best option for your specific needs.