Making the Order Summary Collapsible on the checkout page helps in the small screens of mobile phones.
Here's how you can enable it for your checkout page using Elementor:
Step 1: Click on the 'Edit' button to edit your checkout page using Elementor
Step 2: Click on the pencil icon of the Checkout Form widget
Step 3: Go to the Sections tab and select the 'Collapsible Order Summary' option
Here you'll find the option to enable the collapsible order summary.
Simply hit the toggle to enable it.
You can also set the collapsed/expanded view text from here.
Also, you can choose to enable the coupon field and make it collapsible.
Step 4: Hit the 'Update' button to save your changes
There you go! You've now made the order summary collapsible on your checkout page.