Adding some more visual context to these answers as I struggled myself to follow on the above, even though those helped me find out Branches Again. So, in the Source control you may need to look at the end of the pane for GITLENS. There are two ways of doing this:

1. Find GITLENS collapsible section in Source Control Extension and Right-Click to get this:

2. Or Click three dots and play with Group/Detach Views