Shopify login process consists of 3 screens (screenshots attached). The first screen is here:
I entered the store address, and using the Chrome extension, clicked on the gear, chose New Login, and saved.
I clicked Next, entered the email address, chose New Login from the Chrome extension, and clicked on Update Existing.
I clicked Next, entered the password, chose New Login from the Chrome extension, and clicked on Update Existing.
The 1Password entry shows the email address in the username field, and the password in the password field. Nothing with the store address.
If I open a new browser window, go to the first Shopify login screen, and click on the Chrome or Firefox extension menu, there's nothing for Shopify.
If, however, I manually enter the store address and click Next, 1Password Chrome/Firefox extension is ready to populate the email address. And if I let 1Password enter the email address and I click Next, 1Password is ready to enter the password in the screen that follows.
I'm guessing that a three-field login is more than 1Password was designed to handle. And it's not a big deal to type or paste the store name. But do enough 1Password users log into Shopify to warrant a "special case" template for it?
1Password Version: 7.3.1
Extension Version: 18.104.22.168 Chrome
OS Version: macOS 10.14.5
Sync Type: iCloud