problem during back testing

when carrying out back testing ,the current ask and bid line always stays on the screen, irrespective of how what date I have gone back to .
for eg: if im on a 4 hour chart and I go 3 years back in time and back in 2015 and 2018 there is a 2500 pips difference,the chart will squeeze 2500 pips on the screen , which is not required as it makes the candles that u looking at (2015) very small and most of the screen goes unused.
Coming from mt4 this particular problem seems like a major setback.