Yes, scrolling can be prevented when the off-canvas menu is open in Webflow.
To achieve this, you can use custom code and the Webflow interactions feature.
First, you need to add a custom code in the page settings to prevent scrolling. Open the page settings, go to the Custom Code tab, and choose the Head Code section. You can then paste the following code:
```html
```
This code applies a class called "no-scroll" to the body element, which will prevent scrolling.
Next, you need to set up interactions to add and remove the "no-scroll" class when the off-canvas menu is opened and closed.
1. Select the trigger element, such as the menu button, and create an interaction on its click event.
2. Add a new action to the interaction and choose "Set Class" from the dropdown.
3. Set the class name as "no-scroll" and choose to add the class.
4. Set the target element as the body element.
5. Save the interaction.
This will add the "no-scroll" class to the body element when the menu button is clicked, preventing scrolling.
To remove the class and restore scrolling when the menu is closed, you can create another interaction.
1. Select the close button or any other element that closes the menu.
2. Create an interaction on its click event.
3. Add a new action to the interaction and choose "Remove Class" from the dropdown.
4. Set the class name as "no-scroll" and choose to remove the class.
5. Set the target element as the body element.
6. Save the interaction.
Now, when the menu is opened, the "no-scroll" class will be added to the body element, preventing scrolling. When the menu is closed, the class will be removed, allowing scrolling again.
Remember to publish your site for these changes to take effect on the live site.
Note: This solution uses custom code and the interactions feature of Webflow, so it may not be available on all pricing plans. Check the Webflow pricing page to see if these features are included in your plan.