How to move the gizmo of a section of to make a scale (NOT relative to the center of the selection)? When I do it with the cursor it crushes all in 1 single point
When you say section, I assume you mean selection or group of objects (more than one object). First you move your 3d Cursor from the origin (0,0,0) to where you want to center your transform.
Then select your objects, set "Transition Orientation" to be relative to "Cursor", than any rotation or scale or move will be relative to that cursor point.
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