You want to be in FCC mode - you will have a dramatic range improvement and better signal strength compared to CE. Nothing unsafe about it to my knowledge. Virtually everyone who has a DJI drone in a CE area uses FCC mode and I have never read about a negative consequence. If you're in North America you will be in FCC mode by default, but many other countries default to CE so you will want to change it.
What are FCC and CE mode? I know about P, S and ATTI mode but what are they?
They are not really flight modes or features of the drone in the same way that P and ATTI are for example, but rather product certification standards used by different countries to govern things like radio frequencies and to allow the movement of certain products in/through the country. North America uses FCC (Federal Communications Commission) and Europe for example uses CE (Conformité Européenne - or European Conformity). They are just different compliance standards. If you look on the bottom of some of your electronic devices or phone chargers, chances are you'll see a "CE" symbol there.
I see you're in the UK so you may find this to be an informative read:
https://celectronics.com/pdf/ce_brochure_en.pdf
How does it give you more range though? It was in a post about tips for newbies yesterday
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