how to do this design ?

I try to do a more complex design : 

I have created two frames that I want to join :

And when I try to move with the mouse the bottom frame towards the other, I have this design :

But I don't know how to remove the blue lines between the two frames (the lines at the junction of the two frames) ?

I try the most possible to write in english, to improve my english learning.

I have tried to do another more simple design in the parent page : a text block inside a rectangle. And I have grouped the text block and the rectangle in order to have a single bloc.

And I have found the way in order to have the text surrounding this object when I am by example on "page 2" : I have selected the object in the parent page and set "text wrapping" to 5 mm around this object.

And here is the result on page 2 :

On this page 2, I don't understand why around the object (created in parent page), I have not the same space around the object (I should have 5 mm all around the object) ?

About this design I create in the parent page : I have applied this design to left pages of my document.

On page "2", it is OK (I have this design created on parent page), but I would like that automatically the text on page 2 will not begin inside this design but around this design. How to set it inside parent page (design locked in parent page) ?

Create the shapes/text frames on a parent/master page.

Create based on parent/master pages for each tab.

Cntl-Shift or Cmd-Shift click on the tabs you do not want on a given parent/master and delete them.

Make any changes to the original parent/master.