Doesnt let me increase frame duration

Every time I save and get into story board and into my project and edit it, it won’t let me increase the frame duration, I can decrease it but it wont let me increase it please tell me what it is I have to do because I restarted story board multiple times.

Can anyone help me please


Can you check if Storyboard > Lock Scene Duration is On ?
Also, frame duration doesn’t mean much, are you talking about the panel duration ?

Let me know