Which button should be selected to adjust the level of access for a guest collaborator?

Selecting the option to manage collaborator is the correct choice for adjusting the level of access for a guest collaborator. This functionality typically allows you to view and modify the permissions associated with each collaborator, including what they can see and edit within the project. By managing a collaborator, you can assign them different roles, adjust their access levels, and set restrictions that best suit the collaboration needs of your event planning.

The other options focus on different actions related to collaborators. Inviting a collaborator simply brings them into the project without any controls over their access levels. Editing a collaborator often pertains to modifying existing details like name or contact information but doesn’t directly address changing access levels. Removing a collaborator is a definitive action that eliminates their access altogether, rather than adjusting it. Therefore, managing collaborator is the focused action required for adjusting access levels effectively.