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Problems with Permalinks
there no option to change from praca to praca_1
i think problem is cause previous existed praca, deleted & again created
there no option to reset/rebuild folders url
my page is oga pl
But you want to change praca_1 to praca and not what you say above (praca to praca_1). And what do you mean that there is no option? No option to rename?
Your problem can only mean that category "praca" EXISTS. Maybe it exists as some Subcategory and you can see it easily.