Show tag notes in day summary - Notes will be displayed in bottom right part of Day view

Number of Recent tags - how many tags will show up on dropdown menu on Day view, after you select some time (number of tags in the image below).

Add notes to 10 recent tags - when checked notes will be part of the context menu which shows 10 recent tags

When new tags overlap with existing tags -  this setting will be used, when transferring tags from autotags or when using Advanced search for tagging