In the toolbar of Products section in a Sales Order or Quote, you have set the itemGroup element as visible using adaptation mode, however it still doesn't appear in the toolbar of the section.
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The itemGroup UI element is directly linked to the Add button, so if the Add button is hidden the itemGroup will also not be visible, as itemGroup have no use if the button Add is not present to add the selected product to the list.
Besides having the itemGroup visible, you also need to make the Add button visible to have it on the screen.
itemGroup; Products; Section; List; Visible; Adapt; Add; Value Selector; , KBA , AP-RC-UIF-FLX , Page Layout & Key User Configuration , How To