How to change flowchart shapes in Excel
In Microsoft Office in general and in Excel, you don't need to plan because you can easily change the shape outline at any stage.
To change flowchart shapes in Excel, do the following:
1. Select the shape you want to change:
2. On Shape Format tab, in the Insert Shapes group, select Edit Shape dropdown list:
3. In the Edit Shape list, select Change Shape dropdown list and then choose the shape you prefer:
4. Change the format for the changed shape:
See also how to change format shapes in Excel.
See also this tip in French: Comment changer les formes de diagramme dans Excel.