GNOME not able to Expand to fit Screen

Dear Sir or Madam,

I have just updated my Linux operating system to GNOME and since
upgrading I cannot expand it to maximise the full screen of my laptop.

I experienced this problem when I used the old version UBUNTU but I
installed Guest additions to fix the problem as I am running from
VIrtualBox VM. 
 
Installing Guest additions on this occasion has not worked.

Can you please help me fix this problem?

Many thanks
 
Prince

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