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Learn PolishAnia Marysia, thank you for your question. This is a very interesting point.
As you write ź or z with a dash, it sounds softer and occurs in words, for example: źrebak (foal), źrenica oka (pupil of the eye), źródło (source). Ż sounds harder. Ż is used in words, for example: żaba (frog), żyrafa (giraffe), życie (life)
About keyboard... When you set the keyboard version "Polski - pro" then you will be able to type ź and ż on it. In what way? ź - alt + "x", ż - alt + "ż"
I hope my answer has helped you 😀