Importing several single DICOM files as a merged and stacked DICOM file

Operating system: Windows 10

Slicer version: 4.13.0

Expected behavior: To be able to view and segment my imported DICOM files as a merged file and can go through them slice by slice.

Actual behavior: After importing my DICOM files, I can only see a single slice on the 4 screen viewer. I cannot drag the arrow and see several slice in series but only see one slice. If I want to see my other slices, I need to make them visible individually which means the previous view will be disabled to be looked at.

Any suggestions on how to import/merge the separated DICOM files into 3D Slicer?

Thank you.

Read the files using DICOM module as described here: DICOM — 3D Slicer documentation