Hello Desita,
you already got few answers. Yes, the EAs are not connected to the leverage. The leverage is about your trading account. If you have 1:100 leverage it means that you can open a position 100 times bigger than what you have in your account. Of course, this might quickly blow your account and we do not do it, because it is very risky. For example, if you have an account with 1000 dollars inside and leverage 1:100, you can open a position for 100 000…
No matter what leverage you using, when you trade with Expert Advisors, you should keep good money management and not risk more than 2-5% of the account.