Why can't you change the fuel mixture mode in qualifying on the downhill lap? You can set the LEAN mode on the outhill lap and change it to STANDARD later. Such a change on the downhill lap would be...
Ideas
Yes. It's supposed to be like in real life. But is it like that in this game?
Yes, fuel modes were restricted by the FIA prior to Imola in 2021.
F1's 'Party mode' ban – What are the changes to engine modes and why do they matter? | Formula 1®
About half way down it mentions the following "The new Technical Directive will require the power unit to be run in the same single mode during qualifying and race."