random drop-down menu

[danceproof]

In one sheet within my workbook, a grey menu/navigator has appeared. I've attached a print-screen view of this sheet.

The menu allows you to hide & unhide columns etc using the '+' and '-' buttons you can see in the first row of the grey menu. Clicking on the numbers down the side of the menu unhides more sections of the spreadsheet, and causes more '+' and '-' buttons to appear. I cannot close or hide this menu - it will not respond to right-clicking.
Does anyone what this menu is, and how I can get rid of it?

[royUK]

Your post does not comply with Rule 1 of our Forum RULES. Your post title should accurately and concisely describe your problem, not your anticipated solution. Use terms appropriate to a Google search. Poor thread titles, like Please Help, Urgent, Need Help, Formula Problem, Code Problem, and Need Advice will be addressed according to the OP's experience in the forum: If you have less than 10 posts, expect (and respond to) a request to change your thread title. If you have 10 or more posts, expect your post to be locked, so you can start a new thread with an appropriate title.
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EDITED THIS TIME ONLY

[royUK]

I don't see how a word doc helps us solve an excel problem, attach an example workbook