QUICK ANSWER
No
The ability to pause the annual assessment no longer exists as the DVSA requested the removal of this ability back in 2019.The annual assessment must be completed in a single session. If you do navigate away from the exam then your progress may be lost and you risk defaulting your score to a fail.
If you believe you may not be able to complete your assessment in a single session, it is advised to wait until you know for certain that you will be able to complete it undistracted.