Hello,
Thank you both for your suggestions!
As I am using Twenty-twenty four, I decided to follow the advise, regarding the plugins. As I deactivated them one by one, now it seems that the problem is with the “Jetpack” plugin. After deactivating it, the note box appeared, as it per normal.
Additional question, do you have any idea on how i can fix the problem with the “Jetpack” or suggest me other alternative of it?
Thank you for the support and for the additional answers!