Just discovered the Microsoft Learn button in my AZ-700 exam today, it was a great addition as exams should not be just based on pure memorization.
HOWEVER ..... BUGS ~
The PearsonVue exam proctor tool definitely have bugs when using the MS Learn pages, first when I launch it, when I tried to close the tabs - it brought me to a GREY SCREEN with only Proctor Bar (chat, whiteboard, etc.). I was able to chat Proctor to relaunch the exam and continue forward.
However when I have the MS Learn pages open and finished the exam, after time-out, gave comments on questions, quickly flashed the results. The PearsonVue proctor software crashed again and only shown GREY SCREEN and Proctor bar - I have to contact the Proctors to manually close the exam on their side. However the PearsonVue portal, the exam is hung on "In Progress" status, previously the PASS/FAIL status would show up immediately.
So ended up having to submit ticket to PearsonVue - hope the exam results is not lost.. 

