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Question: why is it so hard to delete things from worksheet?

Question:why is it so hard to delete things from worksheet?

nm 10239
interface
January 06 2015
2

2 questions: How would one delete  an execution group that is at top of a work sheet? Like this:

No matter what I do, I get a beep. I select it, click DELETE and nothing happens.

THe second question, is how to delete the last section arrow I added by mistake and do not want, this one:

I found I can remove if I select it with the line above, but then that would delete the code above also, which I'd like to keep.

Why is so awkward to use Maple user interface like this? Is this by design?

To make it easier, I attach the above notebook.

 

hard_to_delete.mw
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