OK, so you’ve known for a long time that Command + Tab switches applications. And you’ve long since figured out that Command + ` (backtick, also known as the ~ key next the number 1 key) will switch between windows of the active application. But have you noticed that it doesn’t work in Photoshop? To switch between open windows in Photoshop, simply use Control + ` (backtick) to switch between windows.