Where-is-data-amount-for-backtest-set

Hi,
1) Streaming data is set by Tools/Preferences/Data/Amount of data to load into chart
It is set up for 800 and for 1 minute or 10 second charts I see 800
2) My question is for back test runs. What is seen on the price pane.
a) For Day runs the depth as seen on the price pane seem to be 250 days. I have 16 years worth of data. In WL6 I could see all of the data and moving averages on the price pane.
I have the 500 day SMA and EMA plotted. It appears that more than 250 data points are used as it should be. Although only 250 are shown. Here is the code:

CODE:
TimeSeries ema500 = EMA.Series(allBars.Close, 500);
ema500 = TimeSeriesSynchronizer.Synchronize(ema500, bars);
PlotTimeSeries(ema500, "EMA(500)", "Price", textColor, PlotStyle.DottedLine);

b) For 1 minute runs it appears that 40 plus days worth of data are shown on the price pane. This is not important for my purposes.
Question: Where is the backtest data depth set? Especially for day charts is it possible to see all of the ASCII data that is provided.
Note: I see these numbers (250 for day and 40 days for 1 minute) whether I use Schwab $SPX or ASCII data.
Thanks!