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The Annotation style section contains icons for configuring annotation colour and transparency.
All annotation styles are set by clicking the icon and choosing a colour, number, or percentage from the dropdown menu.
Clicking the annotation thickness lets you choose the thickness of the line of your annotation
You can choose a number from 1-10 in the dropdown menu:
Clicking the fill colour lets you choose the fill colour of your annotation (if its a closed shape)
You can select a colour from the dropdown menu: