Deleting of Tick Data
If you wish to delete tick data for any reason, you can use the built-in symbol management window in MetaTrader 5. The tick data doesn't require any special modifications to your MetaTrader, so that deletion can be performed easily.
Open symbol management
Please open the symbols management window by navigating View - Symbols to do this.
Search for symbol and delete
Next, please search for the name of the custom symbol you want to delete and remove it using the right-click context menu.
This action will eliminate the tick data and the custom symbol from your MetaTrader instance.