Fairlight: Why "Playback->Go to ->In - Out" is disabled?

FIRST ISSUE :Being on Fairlight, what is the reason why the menu Playback->Go to ->In & Out are disabled, even when mark in & out is setup on the timeline?
Therefore, the keyboard shortcut "Go to Mark In - Go to Mark Out" never worked to me on Fairlight.
I will appreciate your answer and solution.
SECOND ISSUE : Mark->"Clear In", "Clear Out" and "Clear In & Out" Appear enabled on the menu, however, being on Fairlight there is no action both using the menu or the shortcut. I'm aware that I can click with the mouse on the workspace to clean mark in-out, but what if I'm editing with my mouse the dynamics/EQ and I can't completely control my playback with the keyboard through in/out markers? Keyboard shortcuts always complement mouse action. Why to disable functions? Any solution or reason?
Therefore, the keyboard shortcut "Go to Mark In - Go to Mark Out" never worked to me on Fairlight.
I will appreciate your answer and solution.
SECOND ISSUE : Mark->"Clear In", "Clear Out" and "Clear In & Out" Appear enabled on the menu, however, being on Fairlight there is no action both using the menu or the shortcut. I'm aware that I can click with the mouse on the workspace to clean mark in-out, but what if I'm editing with my mouse the dynamics/EQ and I can't completely control my playback with the keyboard through in/out markers? Keyboard shortcuts always complement mouse action. Why to disable functions? Any solution or reason?