Synchronize only new signals?

 

I have subsribed to one of the signal providers here. The issue is this trader had many open trades. And the moment I subscribed it 'synchronized' with his/her account opening trades at my account at a very very bad moment.

How to avoid situations like this in the future? So only new signlas will be syncd?

ps: The lack of 'close all' didn't help either.

ps2: bonus question: how to magnify the lot sizes, because all 0.01s is not really making any money. I googled and I found a topic on this forum which says 'you have to search'.