Shift-right click menu hidden by thumbnails

I tried searching old threads for this, but I'm confused about the name for the Win 10 menu I need to access. It's the one with the choices: cascade, show windows stacked, show windows side by side, restore all windows, minimize all windows, and close all windows. It's been around since Win 7, I think.

Normally, that menu shows when you shift-right click a grouped set of app windows in the taskbar. My goal is to restore all windows of a group at once ("restore all windows" in the menu I referenced above).

With 7+ Taskbar Tweaker, I love the feature that shows the thumbnail previews on hover. The problem is that the hover doesn't go to the background when I shift-right click. The thumbnails cover the menu I referenced above. I can't see the options, although I can choose them by arrow key. If I can't see what I'm choosing, however, it's risky to use it.

If I disable thumbnail previews on hover, using the list, the problem goes away. The list goes to the background when the menu referenced above is shown. But if I switch back to the thumbnails, they won't go to the background and they cover the menu.

I'm on Win 10 Pro 1803, 7+ Taskbar Tweaker 5.6. No other mods to taskbar or desktop.