Hi NitinGoswami,
Based on your description, when you want to add web parts in SharePoint team site, in the web part list, you cannot see the web parts. We’d like to confirm some information.
- Does this problem happen to all the team sites you have? Can you add web parts in the existing team site? And please try creating a new team site then check whether you can add web parts on the newly created team site.
- From the screenshot you provided, the list may be stuck for some reason, so could you try changing to another Internet environment, then refresh the website and check whether the list is updated.
Regards,
Tisky