Can't Edit Callout Boxes

Hi,

That is normal when you select the "Add text callout" as opossed to when you use other comments or annotations geometrical shapes, sticky notes or a text box.

So as you've observed, the text callout (with an arrow) is a annotation type composed of various shapes and elements that allows the editing of the text that will be typed in in the floating textbox as well as the arrow which allows the enlarging or decreasing of the size of the arrow, and it will do so independently from each other.

In addition, by grabbing any of the outer edges of the rectangular frame with the Selection Tool (the black arrow), it allows the user to manipulate all the elements that are inside of that shape bigger or smaller in unison (or as a single entitiy as you've described).

However, I've noticed myself that this feature becomes burdensome and glitchy to work with if the Page Zoom is anything under 100% zoom.

If you increase the zoom for that page, you'll be able to click inside the text box with ease, work with the arrow or even right-click on any area inside of the rectangle to invoke the "Porperties" context menu (which is what you're looking for - if I understood your question correctly-).

That said, when you're able to open up that context menu, and select "Properties", the "Callout Properties" dialogue window will open up; see in the "Appearance" tab (first tab from left to right) if the tick box "Locked" is not checked.