Safari Expanding Every Tab in the Tab Group

Hi folks,

I just updated Safari and now it is exhibiting an unwanted behavior. I depend on tab groups, and now when I click around in and out of my different groups, every tab for the group expands in the sidebar.

My question: how do I prevent a tab group from displaying every member item in the sidebar every time I click on the group?

I'm running macOS Sonoma 14.7.1.

Thanks in advance for your help.