Yellow/Sticky notes functionality is not available in Cloud yet. If Sticky Notes are used to save some additional information connected to an object, then an alternative to use would be Custom Fields.
 

Thanks Dilini. Will it be available from 21R2 or from a later release?

R&D has noted the request to find an equivalent solution to sticky notes in future and it will be considered, but there is no such solution planned for the upcoming releases yet.

We are planning on finding alternate methods of dealing with the sticky notes now and not depend on when IFS might implement a change because it might impact our ability to upgrade now if we are dependent on it.