I'm flowing a 400 page book with 1 sidebar per page. The running text is 2 column (set up with split columns) the sidebars span the columns. Editorially the text should flow top to bottom, but instead it flows left to right, with the sidebar splitting the text. If I extract the sidebar, put it in it's own text box and apply a text wrap, the body text flows correctly. Extracting the text would be very labor intensive, is there a way to make the text flow correctly while keeping it all in the same text box?
That's how the span column feature works. Making the sidebar and anchored object, again a separate text frame, but it should flow with the text, should work. Text wrap on custome positioned anchored objects affects only lines following the one that contains the anchor.