Modification on Modern SP site

[learningMSP]

Hi All,

I am new to Sharepoint and in learning phase. I have access to two different SP sites and both are Modern sites. I am trying to create list using "Existing list" (List 1). In one of my list, i can see this option and but in another i couldn't (List 2) get that option. Could anyone please help me on what changes need to be taken on my List 2, to bring it similar like List 1?

List 1 :

List 2: 

[#2]

The experience when creating a list should be the same for both sites....seems to be a bug or at least there is a difference in the access you have on each site