DockView has always answered one question when you hover a Dock icon: what is inside each window of that app. You get live thumbnails, you read them, you click the right one.
Version 2.2.4 adds a second answer to the same hover. macOS has its own way to show the windows of one app: App Exposé lays them out full size across the screen, the way the trackpad gesture does. DockView can now call it for you, on the icon you are pointing at, without switching to that app first.
Choose which one you get
The setting is Preview → When hovering a Dock icon. Leave it on the preview panel, or switch it to App Exposé and let the system do the layout.
The part I like more is the middle option. Assign a key in Show App Exposé, one of Command, Option, Shift or Control, and both views are under your hand at once: point at an icon for DockView's previews, add the key for the system layout. Press the key after you have already started hovering and the view changes on the spot. Keep moving along the Dock and the layout follows the icon.
The two are good at different things. Previews are small and readable, so you can tell two similar documents apart. App Exposé is full size and spread over the whole screen, which is easier when an app has a lot of windows and you only need to recognise the shape of the one you want.
One click instead of a hover
The preview panel has a new button in its header, next to New Window: Show All Windows. It hands the app over to App Exposé in one click, which is handy when you opened the panel, did not find what you were after, and want the wide view without starting over.
Settings that fit on the screen again
The Preview tab had grown past the bottom of the window. Settings are now split by what they actually do. Preview holds what appears when you hover the Dock and when: hover delay, which windows are listed, windows from other desktops, minimized windows. Appearance holds how the panel looks: theme, animation, thumbnail size, the gap from the Dock, the style of the buttons on a thumbnail.
If you follow a setting path from an older note of ours and cannot find it, that is why. The documentation is updated to the new paths.
The free way in
If the only thing you want is that system layout on hover and nothing else, we have a separate free app for it: Quick Exposé, which we rewrote this week. It does that one job and stays out of the way.
DockView is the full set: previews, the system layout, a window switcher on Option and Tab, numbered Dock shortcuts and window actions from the preview.
Never heard of this macOS feature at all? Here is what App Exposé is and every way to trigger it without any of our software.
DockView 2.2.4 is out now. Existing copies update themselves, and if you do not have it yet, the download button is on the DockView page.