Theme settings change every graphic. Switch to Graphic to change just the one you've selected.
Change one graphic
Select the graphic in the list on the left, for example Scorebug.
At the top of the right panel, switch from Theme to Graphic.
Change its scale to make it bigger or smaller.
Drag it in the preview to move it where you want it on screen.
Change any style setting just for this graphic, such as a different colour for the scorebug.
Undo a change
Click the small × next to a setting to put it back to the theme setting.
Good to know: You'll see Unsaved changes until you save. Nothing is kept until you create or update the theme profile. See Creating a theme profile.
Next: Creating a theme profile