For CentOS 7.4 Linux and more recent versions, probably:
Confirm what ArtemL and Hunter Frazier said. This saved me a lot of time. I have to start "gnome-control-center" from a terminal window, then Devices > Keyboard > "Switch Windows of an Application" has to be set to something. On my CentOS-7 machines, the option default is indicated as "disabled", but it is in fact, still active. Specifically, I changed it to "shift-ctrl-alt-w".
This solved a serious problem where an old APL application, running inside an emulator (DOSbox) was not able to use the APL "diamond" character, generated by the "alt-~" (alt-tilde) sequence. On CentOS-7, there is no "System / Preferences ...", and the "Tweak" tool is of no use for this. Thanx for posting CentOS info.