To Enable full screen mode follow below mentioned steps :-

STEP 1

Install VirtualBox Guest Edition on CentOS 7

Installation

1)Enable EPEL repository

		
sudo rpm -Uvh https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm

2)Install all prequsites be executing below command

		
sudo yum install perl gcc dkms kernel-devel kernel-headers make bzip2

3) On virtualbox window navigate to Devices > Insert Guest Additions CD image

4)Click Run to start installation and reboot your virtual machine.

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Install VirtualBox Guest Edition.