I installed a Chrome extension, it had a small icon in the top bar between the URL and the three-dots menu.
Then, I hide the extension, thinking I would not need it anymore.
But now, I realize I want to always see this extension's icon, so I want to unhide it.
Most online solutions talk about small icons above "New tab", but I have no such icons, despite having dozens of installed extensions, most of them hidden:
Chrome 79.0.3945.130 on Mac 10.15.2