Staff Visibility Issue

So I am working on an orchestra piece and I hid a few of the instrumentation staves because in those particular measures they are empty for long variations which the MuseScore handbook says on Instruments, staff setup and templates. Yet, upon needing these instruments once again, I cannot seem to un-hide them in the system. The MuseScore handbook simply says to right click the staff and press, "Un-hide staff". But how is this possible when I cannot access the staff as it is hidden from the score? I have below, two screenshots with red outlines of what I mean. The "Instruments" panel beside "Palettes" and "Properties" shows all my chosen instruments, yet I cannot show them on the score.

Best,
Josiah M. Bayne