Hi,
Yes there are limits set of the specific set of resources as the account is free to test and play around to learn and get bit of hands on experience, it is not for production use. If you are looking for more advance specs of the resources you can try pay as you go subscription as this will allow you to tune the services as you like.
Check the link and limitations of the free account here.
https://azure.microsoft.com/en-gb/free/free-account-faq
Hope this helps.
JS
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