What Android version you have ?
In Samsungs there are different changes for system keys between TouchWiz versions, so try some solutions first
1. Long touch on last apps key, works for some versions
2. Use system settings accessibility options
3. Try apps like All in one Gestures (info in GPlay "can be used without root for Android >= 5.0")
Still no solution ? Just see what other peoples are doing
Sorry, couldn't help with CZ translation (just using PL one).
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