The Band e.g. pageHeaderBand or detailBand can be setup so the information within that band area will take on the style of the overall band rather than editing individual labels. The Query Builder Style has created Styles for these bands.
1.Click on FieldCaption under Report Explorer
2.Click on the … ellipsis beside Font
3.Change font to Calibri
4.Select the Foreground Colour and change to Black
5.Select DataField and change font to Calibri