the S10 series (and note 10) does not have notifications lights like the older models there are some 3 party apps though that make the camera hole light up when you get notifications
I am not sure but maybe you have those 2 options...like on the Note10+
Make a search in the settings with the word Notification, you should find 2 way to activate Notification Light (Edge lighting)
To activate the edge light notification, just follow these steps: Settings> Display> Side screen> Light notification> check the option: "Activated".
Then you can choose to display the notification: -when the screen is on; -when the screen is off; -always;
You can also choose the style: effect, color, transparency and width.
And you must also go to "Notification management", to select the applications for which you want this notification.
Pour activer la notification lumineuse edge, il suffit de suivre ces pas : Paramètres > Affichage > Ecran latéral > Notification lumineuse > il faut cocher l'option : "Activé".
Ensuite, vous pouvez choisir l'affichage de la notification : -quand l'écran est allumé; -quand l'écran est éteint ; -toujours;
Vous avez aussi la possibilité de choisir le style : effet, couleur, transparence et largeur.
Et il faut aussi aller sur "Gestion des notifications", pour sélectionner les applications pour lesquelles vous souhaitez cette notification.
