I used the Annotate tool to make some annotations in the 3D viewport.
I would like to edit, hide or remove them, but I can't find the annotate layers editor.
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Selecting again the Annotate tool will display a menu in the header. By default an annotation layer called "Note" is used.
From that menu, the layer visibility can be toggled, as well as adding / removing layers, and changing some little things like the color and the thickness.
Note: if the header is hidden, it can be displayed again using the little downwards arrow at the top margin of the 3D window.
Edit: ᴊᴀᴄʜʏᴍ ᴍɪᴄʜᴀʟ made me realize that there is another, more natural, place where the menu can be found! The 3D viewport's sidebar (aka "the N menu"), under View > Annotations
Right Click on the Header area and select Show Tool Settings. I was trying to find the solution as well and came across the instructions in the Blender Manual: https://docs.blender.org/manual/en/latest/interface/window_system/regions.html