These mean the same thing, but "totally" is informal where as "fully" is more formal.

Hey Danyel! Both ‘totally’ and ‘fully’ are correctly used in the phrases. To ‘totally’ or ‘fully’ agree means you 100% agree. Here are some other alternatives: Completely agree Utterly agree Absolutely agree Entirely agree Undoubtedly agree I hope this helps 😊

They both are the same and „fully“ and „totally“ are synonymous in this context. I disagree that one is colloquial and the other (fully) more formal. I don’t get that feeling at all.

Both are fine. The first is for friends, and the latter is best used in formal work settings.

Both are correct, however fully can be considered more formal and totally more informal.