Show http:// again in chrome

Since Chrome 83 there is an omnibox-context-menu-show-full-urls flag that enables showing full URLs in the omnibox.

chrome://flags/#omnibox-context-menu-show-full-urls

1. Copy and paste the URL.
2. Select Enabled.
3. Relaunch the browser.

Now you'll see the full URL in the address bar:

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For Chrome 82 and older:

The easiest solution now is to just to download the Suspicious Site Reporter extension from the Chrome Store. And that's it.

As we can see in the source code, the protocol will not get hidden if this extension is installed:

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Previously, setting the omnibox-ui-hide-steady-state-url-trivial-subdomains flag was the easiest way to show the "https://www." back again, but it has been removed as of Chrome 76.

chrome://flags/#omnibox-ui-hide-steady-state-url-trivial-subdomains

Just for future reference, in the current chromium version you need to disable both of the following flags in order to get the full URL:

chrome://flags/#omnibox-ui-hide-steady-state-url-scheme

chrome://flags/#omnibox-ui-hide-steady-state-url-trivial-subdomains

Edit: See above answer

You can navigate to chrome://flags/#omnibox-ui-hide-steady-state-url-scheme-and-subdomains and disable Omnibox UI Hide Steady-State URL Scheme and Trivial Subdomains.