Hi Carl,
Thanks for choosing Microsoft.
According to your description, it seems that you created a Managed Metadata column in SharePoint document library, while you chose an item form a metadata filed which jumped up to the top of the list and displayed the Activity list. May I know this is your
scenario?
I follow your detailed steps and create a Managed Metadata column, when I go to the details pane, select the item from the metadata tag, it won’t jump up to the list as you mentioned.

May I know my steps are same as yours? If not, please correct me.
To narrow down it, you may switch different browsers or an InPrivate window mode to see the result.
Besides, could you please provide some information to further investigate your issue?
- Do other SharePoint sites also encounter the same behavior? Please create a new site and check the result.
- Whether all document libraries or just this specific document library has the issue?
- If you receive any prompt or error, please capture the screenshot of it.
- Please capture the screenshot of “the whole screen has jumped up to the top of the list and displaying the Activity list”, if possible, a reproduced video about your scenario is highly appreciated.
Welcome to share any information with us. 😊
Best regards,
Gloria