What is new in the IEC 62366-1 AMD1:2020?

This is an excerpt from the course "Introduction to Usability engineering and IEC 62366-1" which is available at:

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Read more about what's new in the IEC 62366-1 AMD1:2020 here:

Chapters:
00:00 Introduction
00:20 About the instructor
00:58 Main changes introduced by Amd 1
03:40 Summative evaluation planning additions
05:20 The analysis of errors
06:27 Primary operating function
07:48 Risk management and Usability engineering
08:22 User interface specification
09:19 Additional resources

[ayaalmowafy]

For the primary operating function … is it a must to be included in my product if mentioned in the particular standard or it's optional ?!