The "TAG" tools are only relevant when working with TAG component of the frames. They will be unavailable if the current window is not associated with one of the segmentation (TAG) module.
They include:
This tool enables you to change the color of the different TAGs.
This tool enables you to delete specific TAGs.
This tool enables you to locate specific TAGs.
This tool is used to lock/unlock TAGs. This is very useful when working with different segmentation techniques on the same frames. You can protect (lock) the work already done.
This tool is the old interface used to compute the surfaces and volumes of the segmented images.