As suggested on [1], executing the following command corrects this behaviour in Tails 0.17.1 [2]:
xset -dpms s off
This bugs could be a duplicate of #412373.
[1]:
https://www.linuxquestions.org/questions/debian-26/does-someone-really-know-how-to-disable-the-and-and-_-@-**-and-*-@-screensaver-in-kde4-864104/
[2]: https://tails.boum.org/
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