When right-clicking a text box, and the Text Tool is active, there are two GN4 related menus:

InCopy menu

Add to Assignment

This submenu allows you to manage InCopy assignments for the listed items.

Export Selection

This command allows you to export the listed items to InCopy.

GN4 menu

Create New Article /Img

See Create an article from local items on InDesign page.

Disable Import

See Disable import of text boxes

Remove Content

See Remove Content from Document.