Currently using the Narrative Theme and follow the instructions provided to add a Delivery Date Picker to my Checkout Page.
However, the Date Picker component with the Calendar Pop Out still doesn't appear and I'm not sure why.
Just managed to install this. Did you follow all 3 steps?
2. Edit cart template
3. Edit theme.liquid template
If you miss out any, it won't work.
I have the same issue. I followed every step but nothing happened, except the "sections" part. I had to add 'cart-template' as it was not present. Using Brooklyn theme.