Selecting multiple annotations in one go in Adobe Acrobat Pro

[Tom24705730p3f8]

For correcting my dissertation, I have many comments in the form of annotations / comments. I want to select multiple and remove them. How is this possible? See below for an example. "Define good fit" are all seperate shapes somehow, I want to delete them all in one go, but when I try to select them, a blue box appears and non are actually selected. 

[Document Geek]

The blue box is actually indicating the "ood" is selected. 

Because those were written with a pen, Acrobat views them as multiple annotations. So you'd have to delete them all individually. Or you could select the first, then shift + click on each remaining one, so you have them all selected and then delete them all at once.

[Tom24705730p3f8]

My problem is that this is taking very long. For example, here 

these are more than 30 annotations. How can I remove them efficiently? 

[try67]

Use the Object Selection tool, and click and drag a rectangle around these comments. It will select all the ones within that rectangle. Then click Delete.

[Tom24705730p3f8]

What is the Object Selection tool? If you refer to the blue mouse button, this button will not select any comments / annotations when dragging a rectangle. 

[try67]

No, it's a black cursor.

[Tom24705730p3f8]

Is this the one?

If I drag a box when I have selected this tool, it does not select annotations or comments?

[Test Screen Name]

Can you just go back to a backup taken before the corrections?

Or just re-edit the original (presumably a Word document)?