EXAMPLE -- If you're looking at the COINBASE:SOLUSD chart the indicator will automatically aggregate the volume from BINANCE:SOLPERP, FTX:SOLPERP...etc... BYBIT:SOLUSDT...etc... BTSE:SOLPFC. If an exchange does not have a corresponding pair, then that pair returns 0 and does not add to the total.
If you have any questions feel free to ask. Happy trading!