To adjust a snippet's overall width, you would go into layout mode:
And click the pen icon that says 'Edit', by hovering over the snippet itself:
You can then see an overall table size, this can be large (600px is the maximum width), medium (560px) or small (520px), or alternatively you can select a custom size by typing this into the value that says '600' in the screenshot below:
To change the width of a specific column in a snippet
You would access 'Layout' mode, click onto your snippet and then click the specific column you'd like to amend.
This should bring up the row editor on the right hand side:
Here you are able to adjust the size of the table (the column width), and the image (within the column).
Make sure you save your changes and click 'Back to snippets' in the top right to ensure your edits are saved to your template.
If you have any other questions on editing templates, please reach out to the support team on the live chat or have a look at our wider collection of articles: