Can't add related module block to the main layout

[addady2]

Hi,

I Can't add related module block (activities/todo) to the main layout of Organization.
It not available in the menu (attach some screen shots).

The module is active and function in the "More information" tab.

How to fix it?

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P.S: One of the pic is too width. you need to decrease the font size (zoom out, Ctrl - - ) to see the full pic