When it comes to managing users, QuickBooks offers the flexibility you need in order to achieve your goals. I'll be happy to point you in the right direction with this.
Since you're changing accountants, you can simply do this by clicking the Gear icon > Manage users > click on the Accounting firms tab. From here you can edit/remove the accountant user in question. Here's a helpful article that has more info about: Managing accountant users in QuickBooks Online. The article also shows you how to invite accountant users to the account.
I encourage you to check out the article and if you have any other questions, feel free to reach back to me in the comments below. I'll be one message away in case you need anything else. Otherwise, I wish you a great rest of the week.
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