If your market data provider doesn't support historical Bid-Ask data you will see all historical trades on the Bid side.
Eg. Forex market doesn't provide historical Bid-Ask data.
These indicators can be adjusted for historical non-BidAsk data: mzFootprint, mzVolumeProfile, mzBigTrade, mzVolumeDelta. Choose 'Orderflow – Calculation mode' = UpDownTick.
Hybrid mode and Indian Market (NSE)
Indian Market data providers (eg. Accelpix) don’t translate historical Bid-Ask data so far. For Indian users, Hybrid mode for ‘Orderflow – Calculation mode’ settings has been added. The Hybrid mode uses UpDownTick calculation for historical data and BidAsk calculation for real-time data, which is much accurate. Read more.