To display price movements outside the regular market hours on the chart use one of the options:
This is only possible if you receive such data from your data feed provider. Not all data feeds support pre-/post-market data.
For Barchart, TaiPan xTasyTrader won’t be able to display Pre/Post data.
For IQ-Feed, InteractiveBrokers xTasyTrader can receive pre-/post-market data.