I just installed Ubuntu 18. Since the top bar is only on the primary monitor, I can't use the mouse to grab and move my Chrome window (the top of the screen looks like below). Trying to do so results in grabbing a single tab and opening it in a new window.
Is there a way around this? Ideally, I'd like to have the top bar across all screens. Another obvious disadvantage of only having the top bar on one screen is that the window menu of any window, not just Chrome, is displayed on the left upper corner of my left screen even when the window is in the lower right corner of the right screen.
You can use a Gnome Shell extension, such as Multi Monitors, to add the top bar on the second monitor.
If you're not familiar with installing Gnome Shell extensions, you may want to see this: How do I install and manage GNOME Shell extensions?
For me the easiest option was to revert to the Unity desktop manager (which was standard before but then got replaced by GNOME in Ubuntu 18) using
In the default GNOME window manager that comes with Ubuntu 18, you can move any window by holding down the Windows key while clicking on the window you want to move. Drag it to its' new position and you're done!
Note, in the Unity window manager, used before Ubuntu 17, you would hold down the Alt key instead.
I personally lament the absence of this feature every time I have to use Windows or a Mac.