Insert link to page problem

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Hi
I am very new here, in fact its my first message!

I click the 'Insert link to page' then a pop up appears, however the sitemap is not correctly showing, see screenshot.
Only the folders appears, the '+' to the left of the folder name is off the edge of the pop up so I cant click it. Perhaps I am doing something wrong?

I am using Chrome on a Mac.

Many thanks for your help in advance

Mike

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