absence of some option on Touch Bar

Normally, when I hold a vowel, there is a screen in my Touch Bar where I can type the accented letters such as: à, á, â, ä. However, since a few days I do not receive this screen on my Touch Bar. They do not appear anymore. Though this was the case a few days earlier. Does anyone know what the reason for this is?

PS: I am still able to type them by holding a vowel and a pop-up screen appears in my normal screen, but I liked the Touch Bar option more.