Feature Request - Add Sidebar to Microsoft Edge Apps

I find the new sidebar mobile sites feature very useful. I am a Windows 11 user, so I could previously always just use Windows 11 snap layouts to drag one site to the left and one to the right. But with sidebar mobile sites, as seen in the image, the two sites are now a "locked pair" that can be moved around and resized independently.

I also like the Edge "apps" feature that opens a site in a dedicated window. It helps me organize my window layout better and sometimes helps me keep focus better. However, it appears that the sidebar cannot be activated in Edge apps. I can hit Ctrl + Shift + E to open sidebar search, but I can't activate any of the other sidebar apps.