You should be able to adjust appearance of both the sidebar slider and the hover plot by using
Data>Manage fields>Options>Value colouring (for the slider)
then click on the three dots colour button next to the slider itself

For the hover plot - enable it via the
View's Tools menu (the spanner inside the view)>Other>Hover plot

The slices of the pie (or the bars in the bar/line view) will take the colours you chose in :
Data>Manage fields>Options>Value or category colouring