Strange FL Change

-EGFF1705
-N0399F230 EXMOR1B EXMOR N92 DAWLY N864 BHD/N0447F380 DCT
SALCO/N0449F370 DCT COQUE DCT KORUL/N0396F230 N728 STG UN726 NARBO
DCT RITUS DCT PESUL DCT ABETO DCT DIGAL UZ222 BIRBA DCT ALAGU

Why when only 1h12 into a 2h30 flight does the plan instruct me to reduce my FL to FL230 ??

Quite simply the route you have chosen to use is utilizing low level airways instead of Free Route Airspace.

Select a more suitable routing if required.

It also helps to post the complete routing rather than an extract.

@srcooke is correct.

Just to add, for what it’s worth, your flight was planned before we released the real-world European routes update on Thursday.

Now that this feature is released, the default real-world route for this city pair (EGFF-LPFR) is much better and doesn’t have this issue.

Best regards,