Starting from Foxit PDF Editor/Reader V12.1, we have redesigned the mini-toolbar which would pop up when selecting an annotation or making an annotation in a PDF file.
The mini-toolbar allows you to perform further operations (modify properties, open pop-up notes, etc.) right after an annotation is created or selected.
By default,the floating toolbar appears right after you create an annotation. If you don't want the floating toolbar to appear upon a comment creation, please go to File tab > Preferences > Commenting, and deselect the option "Pop up floating toolbar after comments created",click on "OK" to save the setting.
With the option "Pop up floating toolbar after comments created" deselected, then the mini-toolbar will only appear when selecting an annotation.