Under the following conditions insert icons are displayed.
Enough space
There must be enough space to arrange Insert icons around an object symbol. Therefore, the model display must be large enough to display
Insert icons in the model in addition to the objects.
Thus, Insert icons are displayed when Smart Modeling is enabled and the model display is equal or greater than 60 %.
Permission to use a connection
The user must have a privilege to use the outgoing connection of the selected object. If a user does not have the privilege because the used filter does not allow the connection, the Insert icon for the corresponding direction is not displayed.