Usually, it depends on personal habits and preferences. In fact, we only need an MT4 to switch accounts on different platforms.
According to the foreign exchange documentary community, all you need to know is the trader's server. If there is no login account in MT4, just open the software and this small window will pop up, allowing you to choose the trading server. If there is no server you want to trade in the option, click "Add New Trader", then enter it in the input box, and then click "Scan" when finished. There are also cases where the server cannot be scanned.