Sport mode not working after new clutch fitted .

[Bruce901]

Helloo. Looking for some advice please .

Have a 2017 1.7 diesel sports edition and I absolutely love my car .
However the clutch recently disintegrated at 40k so had new one fitted .
But since then pressing sport button does absolutely nothing , although sport mode is
Displayed on pressing . Funnily enough as well I seem to b getting more mpg or fuel gauge,
Unless I’m imagining it taking longer to drop ( everything seems absolutely normal , no lag , lack of power etc )
Just this sport mode not working , no error codes nothing pointing me to a problem .
Thinking about mayb as simple as disconnecting battery for half hour to “ reset “ ?

Apologies of been covered elsewhere or long winded question .