You can enable in Application settings (DICOM/Allow subseries loading by time) to show each slice as a separate loadable in DICOM module (when “Advanced” checkbox is checked). You can easily switch between which volume is shown by clicking eye icon of a data set in Data module / Subject hierarchy tab.
You can show see the whole slice in a slice viewer if you click “Rotate to volume plane” button.
If you share an example data set then we may be able to tune the DICOM import script to be able to load all the frames at once, as a volume sequence.