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I found helpful article how to make forecasting step by step: https://aginic.com/blog/qlik/forecasting-in-qlik-guide/
I have done step 3. and get the bar chart with no predcited days. I am doing forecasting for the dimension DAY, for the next 30 days from max date (which is 31.12.2018).
TempMaxDate:LoadMax([Day]) as LastDayResident [PAZ2018];
Let vOLastDay = Peek([LastDay],0,TempMaxDate);Let vNextDay = $(vLastDay)+31;
Drop table TempMaxDate;
TempDates:Load $(vLastDay)+IterNo() as [Day]AutoGenerate (1)WHILE $(vLastDay)+IterNo() <= $(vNextDay);