reorder bookmark manally

I am editing hundreds of documents I have to use bookmarks to navigate.  The bookmarks "drag and drop" reorder feature is not working correctly, as it takes many mouse operations and clicks to simply move a book mark into the correct position.  If I have an hierarhcy like this:

1

  1A

3

2

And I want to drag 2 to follow 1A, the item moves and appears to align with 1 and 3, but when I let go of the mouse, it it puts on the same level as 1A:

1 

  1A

  2

3

If click on 2, and hover above 3, the mouse cursor turns into an O with a slash through it: no operation allowed. So I am forced to drop it below 3, or above 2.  The only way to get 2 into the proper position, is to drop it below 3, and then to drag 3 below 2..  

So, to do the operation to correct an hieararchy: I end up with 3 operations, 

1. drag 2 after 1A

2. drag 2 to after 3

3. drag 3 to above 2

This is is extremely challenging.  Why is the interface denying me  the abilty to move a bookmark to the top level, directly following a nested level?  

I want this fixed, or I want to be able to complete these operations using key borard operations, such as with control + up arrow, left arrow etc. to reposition booksmarks, promoting or demoting levels, or reordering them vertically or horizontally.

Architecture: x86_64

Build: 21.5.20058.441104

AGM: 4.30.107

CoolType: 5.14.5

JP2K: 1.2.3.48698