5.4.0 RC1751_svn layouts/? where is it?

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Could someone please tell me where the layouts function (as below) is in 5.4.0 RC1751_svn

The layouts tool from the block area will divide the area into as many parts as you want and give you draggable sliders to control the positioning.

!I cannot see any layouts tool in the block area!!

I would really like to try out this new option, of course the easy way is to use divs in html, content area (below) but I want my clients to be able to do it the easier (I presume) layouts way.

<div style="width: 33%; float: left; border: black 1px solid;">one</div>
<div style="width: 33%; float: left; border: black 1px solid;">two</div>
<div style="width: 33%; float: left; border: black 1px solid;">three</div>

 
mose replied on at Permalink Reply
mose
When a page is in edit mode and you click on "Add to whatever" in an area, you will see the menu item to add a layout.