Certain diagram types like organizational charts or mind maps are built so that shapes are automatically connected to each other at regular intervals using a special line we call an "automatic connector."
This allows you to move or delete shapes without breaking the connection between shapes. After you move or delete a shape, the chart will heal itself and rearrange the remaining shapes automatically.
If you need to adjust this automatic spacing to create less or more space between shapes there are controls to help you.
When you select a shape, you'll see green icons in the upper left corner. One will have an up and down arrow and the other left and right arrow. Click on either icon and without letting go of your mouse drag them up or down or left or right to adjust the spacing of that particular branch relative to the other branches either above or to the side of the selected shape.
This works for organizational charts, flowcharts, mind maps, and cause and effect diagrams.
To read more about spacing automatic connectors, check out this page: