Whenever I change language layout, this notification appears and after 3 seconds disappear and I do not want to see this notification.
4 Answers
My solution for 18.04 LTS. As a Thai people, we have a norm to use the ` key to switch between en/th. So I try it too, and found out that when I chose (pressed) ` key in the settings 'Switch to the next input source', the system automatically choose Shift + ` in 'Switch to the previous input source' for me. And with this settings, when I pressed only ` ..I got a pop-up too. But when I try hold-pressed Shift key and then pressed ` ..NOW it's has no pop-up!. This more safety than the default 'SuperSpace(press these in simultaneously)' that can sometime-freezed the desktop. (But if you have to or want to use `
or ~
(both are on the same key) you can still copy it from characters map.)

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There is special gnome shell extension gnome-shell-quick-lang-switch to hide language popup.

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That language indicating overlay is part of the GNOME shell, so probably not so easy to switch it off completely.
As a workaround you may set another alternative keyboard shortcut to switch between input languages, for example Alt+Shift which will not show the overlay. To do so, follow the Q&A: Ubuntu 17.10 can't change the input switching shortcut to alt+shift.

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echo $XDG_CURRENT_DESKTOP
? – pomsky May 07 '18 at 21:57