In the no-code in-app editor, open the Settings tab in the right panel and expand Document. Two fields control how wide the popup looks on the phone:
- Max width (px): the widest the popup is allowed to be. On a large screen it won't grow past this number.
- Side gutters (px): right under Padding, sets empty space on the left and right of the popup (one value for both sides).
- Raise the number to make the popup narrower.
- Lower it to make the popup wider.
- A negative number is treated as 0.
New templates start at 0 px gutters, so the popup fills the screen width. Check the hint under Max width to see how wide the popup will be with your current values. There's no height setting: the popup grows with its content.
Click Save in the top bar to keep the template changes. To check the result, open Preview from the top bar ⋮ menu.
Learn more: Configure in-app template settings
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