what I mean is, on the chart/VIEW tab, is it set to show extended hours?
answer: no
It seems you don't understand that I say.
1/there are pre market data
But your charts lose the setting of ext hour.
For example:
In a chart I have a symbol A, I go in view, and I chose us equity ext. hour, then I have the premarket, but if I change the symbol to B, premarket and setting desappear.
2nd In all of other chart, I set up view, us equity ext.hour, I don't change the symbol during the sesion, I have premarket. That Fine. But if I close the MT and re open it, premarket and setting have desappear.