What happens if I stop a strategy and apply a new one during market hours?

So, how this works like when you stop a strategy, it no longer controls your trades. Any open positions from that strategy are exited right at point. After that, when you apply a new strategy, it starts fresh — meaning it will only take new trades based on its own signals.

So, in simple by removing the strategy the open trades in that are exited and with new strategy the trades will take entries by new signal.