In the Insiders v1.61 Build now is an experimental feature that would provide a second Side Bar on the opposite side of your main Side Bar. This feature can be enabled with this setting:
Workbench > Experimental > Side Panel: Enabled
It is disabled by default. Note that this second Side Bar is currently known as the Side Panel.
You can drag various views into the Side Panel like the Outline or SCM views. I would expect that more will be added later.
Demos:
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