Does your table have any specification limits set? Using Big Class as an example.
After opening and immediately trying to create Process Capability (no option available):
jthi_0-1637481598829.png
After adding specification limit column property to height column:
jthi_1-1637481659225.png
Edit:
You can also do Capability Analysis from the distribution platform if you don't have the limits yet, good example Process Capability Analysis , see also this
-Jarmo