You can see the executed trading volume on the symbols with .last extension.
First, choose one of them, for example, BTCUSD.last.
Right-click anywhere on the chart and pick "Volumes" from the context menu.
If you are using PrimeBit MetaTrader 5 desktop application, you can find this data on any chart using the PB_Volumes indicator.
The real volume is presented in PrimeBit contacts divided by 0.0001.