Alt+Scroll is in Xubuntu overloaded to have two behaviors: alter window transparency when mouse is positioned on title bar, or zoom otherwise.

When I position the mouse cursor on a window title bar and scroll down, the window gets less transparent. As expected.

If I scroll upwards, hoping to restore opacity, the view zooms in. If I zoom in to maximum magnification, the opacity-control resumes, and I can restore opacity to my windows.

I would ideally like to be able to do both, but I don't want to zoom in to restore opacity to my windows. Is that possible? If so, how?

SOLVED: Turns out it is the horizontal scroll on window decorator that causes the transparency change. I had foolishly turned that on and scrolled with a touchpad, inevitably scolling hotizontally on accident.


1 Answer 1


Change the key used to grab the windows to something else.

In Xubuntu 14.04, open Settings Manager from application menu, or run xfce4-settings-manager in terminal. Then, follow the instructions below.

  1. Go to Window Manager Tweak > Accessibility

  2. In the first line, look for this option^ Key used to grab and move windows: with a drop-down box, then click and change from the default Alt to other key of choice in the list.

  3. Finally, click Close to finish.

Xfce4 Window Manager Tweak - Key to grab

I would suggest to use Shift key, because this key is rarely used for two-key combination shortcuts. This will avoid any conflicting shortcuts.

Another choice is Super key, which is what I'm using now after feeling uncomfortable with the Shift key.

Consider this: If Control key is used for the option^ (step 2), this will cause Ctrl+Mouse click to be disabled. The shortcut is useful to open a link in background tab in Firefox and other web browsers.

Final result: Changing the key to Shift will trigger the zoom function by pressing Shift+Mouse scroll keys and Alt+Mouse scroll on Xfwm title bar will trigger transparency as usual. This was tested in Xubuntu 14.04; however, these functions are inseparable and seem to rely on the same key in newer releases.

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