@Lakotaubp
Oops, I really wasn't awake this morning.
Thousand excuses.
Thanks for translating my post.
And thank you also for the link to the French group and the one to the Volla group.

@Kenada
Thanks for the specific advice.
I have System Theme Suru Dark and scaled to 27 and my eyes are happy.
I didn't touch the Launcher. I only have a problem with the light.
In addition, a big thank you for the autonomy which will inevitably increase.
Too bad the choice of Dark theme is not in System Settings. This will avoid installing Ubuntu Touch Tweak Tool with which we can mess around.
Are settings lost if an application is updated?

@tchan
Thank you so much.
I will continue my good UT day by your suggestion !!!

@Lakotaubp
Oops, I really wasn't awake this morning.
Thousand excuses.
Thanks for translating my post.
And thank you also for the link to the French group and the one to the Volla group.

J’utilise le Volla Ubuntu Touch depuis quelques jours. Je suis globalement très satisfait. Félicitations à tous.
Mais il me reste 2 questions, à cause d’un gros problème de vision :
1 - de nombreuses applications d’origine ont un fond blanc, sans possibilité de passer à un fond noir. Exemples: le clavier téléphonique, la calculatrice, les paramètres système, alors que pour d’autres comme Agenda, Fichiers ou Messages, c’est facile de mettre le fond en noir.
2 - comment afficher en caractères plus épais tous les écrans.
Merci d’avance, si une solution existe car mes yeux souffrent vraiment avec les écrans blancs

 D
 dag-obert
 4 minutes ago

 I have been using the Volla Ubuntu Touch for a few days. Overall, I am very satisfied. Congratulations to all.
 But I still have 2 questions, due to a big vision problem:
 1 - many original applications have a white background, without the ability to switch to a black background. Examples: the phone keypad, calculator, system settings, while for others like Calendar, Files or Messages, it's easy to set the background to black.
 2 - how to display all screens in thicker characters.
 Thanks in advance, if a solution exists because my eyes are really hurting with the white screens.