probably because there aren't any words on the screen... http://www.catb.org/~esr/faqs/smart-questions.html
– j-moneyJan 28 '19 at 14:28
maybe it will help if you press super key and space. While super key is pressed you can alternate between installed languages pressing space several times.
– Dominik CorniceJan 28 '19 at 14:35