Click on the Notification icon at the bottom right of the screen -> Choose 'Expand' -> Then you will see the sun icon, click on that to choose the brightness. Thank you
As for this problem, the most probable and the most likely answer to this would be it depends on the person or the user of it since there aren't any options presented with the problem.
WordArt is there to be of use during presentations, during discussions, and other things. On the other hand, as the technological advancement takes leaps and bounds going forward, this utility seems to be underused and isn't expected to give a more impact to the reader or to the recipient of such document that contains it. This is typically used for people that aren't too familiar yet, as to how to utilize other programs to enhance their documents and files.
This site is only for education related questions. You should only answer or ask questions. That's what we are here for. Whoever is reading this answer, please spread it to stop people from zooming, hurting others, or just posting non-related to education questions. Thank you.