problems with historical data lenght

 
good morning
sorry I do not write English well: I use an online translator
I have a problem with the length of the historical data on Alpari Demo: currently only 27.000 candles per 5 minutes, instead of 65.000 candles
I went to the top "tools" - "options" - "graphs" - last item I set the maximum 250,000 candles but the problem was not solved
o assist in chat Alpari say that it is not possible, but I am experiencing this problem. Could you please help me? 
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